Add cartodb-common as a git submodule

This is a bit of a hack to improve development speed

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "lib/sql"]
 	path = lib/sql
 	url = git://github.com/CartoDB/cartodb-postgresql.git
+[submodule "vendor/cartodb-common"]
+	path = vendor/cartodb-common
+	url = https://github.com/CartoDB/cartodb-common.git

Gemfile

@@ -53,7 +53,7 @@ group :assets do
   gem "compass",               "1.0.3"
 end
 
-gem 'cartodb-common', git: 'https://github.com/cartodb/cartodb-common.git', tag: 'v0.3.7'
+gem 'argon2',                   '~> 2.0' # needed by cartodb-common Argon2EncryptionStrategy
 gem 'roo',                     '1.13.2'
 gem 'state_machines-activerecord', '~> 0.5.0'
 gem 'typhoeus',                '1.3.1'

Gemfile.lock

@@ -6,15 +6,6 @@ GIT
     oauth-plugin (0.4.0.pre4)
       oauth (>= 0.4.4)
 
-GIT
-  remote: https://github.com/cartodb/cartodb-common.git
-  revision: f098950c5fee57686718fea112d198e6e5e3dfd9
-  tag: v0.3.7
-  specs:
-    cartodb-common (0.3.6)
-      activesupport (~> 4.2.11.3)
-      argon2 (~> 2.0)
-
 GIT
   remote: https://github.com/kuldeepaggarwal/fake_net_ldap.git
   revision: d99f2fcf13b9737a150f869fe9b9fbc0d788aa3f
@@ -528,12 +519,12 @@ DEPENDENCIES
   activerecord-postgresql-adapter
   addressable (~> 2.5)
   analytics-ruby (~> 2.0.0)
+  argon2 (~> 2.0)
   avro (~> 1.10.0)
   aws-sdk-acmpca (~> 1)
   aws-sdk-s3 (~> 1)
   byebug
   capybara (= 2.18.0)
-  cartodb-common!
   charlock_holmes (= 0.7.6)
   ci_reporter (= 1.8.4)
   compass (= 1.0.3)

lib/carto/common

@@ -0,0 +1 @@
+../../vendor/cartodb-common/lib/carto/common

vendor/cartodb-common

@@ -0,0 +1 @@
+Subproject commit 85f1132fef28eb4cecd22082a8451499ceb94904