diff --git a/package-lock.json b/package-lock.json
index 51ff80e..6c54835 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,9 +15,14 @@
         "node-pre-gyp": "0.10.0"
       },
       "dependencies": {
+        "mapnik-vector-tile": {
+          "version": "github:cartodb/mapnik-vector-tile#e7ca5471f9e5de81243e6035e70444321fc0a82f",
+          "from": "github:cartodb/mapnik-vector-tile#v1.6.1-carto.2",
+          "dev": true
+        },
         "nan": {
           "version": "2.10.0",
-          "resolved": "http://registry.npmjs.org/nan/-/nan-2.10.0.tgz",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.10.0.tgz",
           "integrity": "sha512-bAdJv7fBLhWC+/Bls0Oza+mvTaNQtP+1RyhhhvD95pgUJz6XM5IzgmxOkItJ9tkoCiplvAnXI1tNmmUD/eScyA==",
           "dev": true
         },
@@ -159,7 +164,7 @@
         },
         "readable-stream": {
           "version": "2.3.6",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "dev": true,
           "requires": {
@@ -950,7 +955,7 @@
     },
     "es6-promise": {
       "version": "3.1.2",
-      "resolved": "http://registry.npmjs.org/es6-promise/-/es6-promise-3.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-3.1.2.tgz",
       "integrity": "sha1-eV4lzrR/e6uyY9FRr77dktGOagc="
     },
     "escape-string-regexp": {
@@ -991,12 +996,6 @@
         }
       }
     },
-    "esprima": {
-      "version": "git://github.com/ariya/esprima.git#a65a3eb93b9a5dce9a1184ca2d1bd0b184c6b8fd",
-      "from": "git://github.com/ariya/esprima.git#harmony",
-      "dev": true,
-      "optional": true
-    },
     "estraverse": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-1.5.1.tgz",
@@ -1080,7 +1079,7 @@
         },
         "readable-stream": {
           "version": "2.3.6",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "dev": true,
           "requires": {
@@ -1112,7 +1111,7 @@
     },
     "fast-deep-equal": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
       "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ=",
       "dev": true
     },
@@ -1594,7 +1593,14 @@
           "version": "1.0.9",
           "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
           "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
-          "dev": true
+          "dev": true,
+          "optional": true
+        },
+        "esprima": {
+          "version": "git://github.com/ariya/esprima.git#a65a3eb93b9a5dce9a1184ca2d1bd0b184c6b8fd",
+          "from": "git://github.com/ariya/esprima.git#harmony",
+          "dev": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.3.5",
@@ -1784,18 +1790,14 @@
       "version": "2.7.3",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-2.7.3.tgz",
       "integrity": "sha1-bUUk6LlV+V1PW1iFHOId1y+06VI=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "mapnik-reference": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/mapnik-reference/-/mapnik-reference-6.0.5.tgz",
       "integrity": "sha1-1SMZ4d+I5aB6gR6E3vKhpCO28F8="
     },
-    "mapnik-vector-tile": {
-      "version": "github:cartodb/mapnik-vector-tile#e7ca5471f9e5de81243e6035e70444321fc0a82f",
-      "from": "github:cartodb/mapnik-vector-tile#v1.6.1-carto.2",
-      "dev": true
-    },
     "md5.js": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/md5.js/-/md5.js-1.3.5.tgz",
@@ -1855,7 +1857,7 @@
     },
     "minimist": {
       "version": "0.0.10",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
       "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8="
     },
     "minipass": {
@@ -1879,7 +1881,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "dev": true,
       "requires": {
@@ -1888,7 +1890,7 @@
       "dependencies": {
         "minimist": {
           "version": "0.0.8",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
           "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
           "dev": true
         }
@@ -1971,7 +1973,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -2121,9 +2123,9 @@
       "dev": true
     },
     "path-parse": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
-      "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
+      "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
       "dev": true
     },
     "path-platform": {
@@ -2487,7 +2489,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -2690,7 +2692,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz",
       "integrity": "sha1-P/IfGYytIXX587eBhT/ZTQ0ZtZA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "signal-exit": {
       "version": "3.0.2",
@@ -2847,7 +2850,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }