Use torque renderer config

Adds some notes about db pool params in torque

config/environments/development.js.example

@@ -162,6 +162,16 @@ var config = {
               type: 'fs', // 'fs' and 'url' supported
               src: __dirname + '/../../assets/default-placeholder.png'
           }
+      },
+      torque: {
+          dbPoolParams: {
+              // maximum number of resources to create at any given time
+              size: 16,
+              // max milliseconds a resource can go unused before it should be destroyed
+              idleTimeout: 3000,
+              // frequency to check for idle resources
+              reapInterval: 1000
+          }
       }
     }
     ,millstone: {

config/environments/production.js.example

@@ -156,6 +156,16 @@ var config = {
               type: 'fs', // 'fs' and 'url' supported
               src: __dirname + '/../../assets/default-placeholder.png'
           }
+      },
+      torque: {
+          dbPoolParams: {
+              // maximum number of resources to create at any given time
+              size: 16,
+              // max milliseconds a resource can go unused before it should be destroyed
+              idleTimeout: 3000,
+              // frequency to check for idle resources
+              reapInterval: 1000
+          }
       }
     }
     ,millstone: {

config/environments/staging.js.example

@@ -156,6 +156,16 @@ var config = {
               type: 'fs', // 'fs' and 'url' supported
               src: __dirname + '/../../assets/default-placeholder.png'
           }
+      },
+      torque: {
+          dbPoolParams: {
+              // maximum number of resources to create at any given time
+              size: 16,
+              // max milliseconds a resource can go unused before it should be destroyed
+              idleTimeout: 3000,
+              // frequency to check for idle resources
+              reapInterval: 1000
+          }
       }
     }
     ,millstone: {

config/environments/test.js.example

@@ -158,6 +158,16 @@ var config = {
               type: 'fs', // 'fs' and 'url' supported
               src: __dirname + '/../../assets/default-placeholder.png'
           }
+      },
+      torque: {
+          dbPoolParams: {
+              // maximum number of resources to create at any given time
+              size: 16,
+              // max milliseconds a resource can go unused before it should be destroyed
+              idleTimeout: 3000,
+              // frequency to check for idle resources
+              reapInterval: 1000
+          }
       }
     }
     ,millstone: {

lib/cartodb/server_options.js

@@ -79,6 +79,7 @@ module.exports = function(redisPool) {
         },
         renderer: {
             mapnik: rendererConfig.mapnik,
+            torque: rendererConfig.torque,
             http: rendererConfig.http
         },
         redis: global.environment.redis,