Added autoprefixer-rails to Gemfile and added browser config, use 'rake...

Added autoprefixer-rails to Gemfile and added browser config, use 'rake autoprefixer:info' to dry run and run 'rake tmp:clear' if changing the config yaml

Gemfile

@@ -233,6 +233,9 @@ gem 'virtus',             '~> 1.0.1'
 gem 'net-ssh',            '~> 3.0.1'
 gem 'base32',             '~> 0.3.0'
+# Stylesheet vendor prefixer
+gem "autoprefixer-rails", '~> 6.3.6'
+
 # Sentry integration
 gem 'sentry-raven', '~> 0.15'

Gemfile.lock

@@ -62,9 +62,8 @@ GEM
     attr_encrypted (3.0.1)
       encryptor (~> 3.0.0)
     attr_required (1.0.0)
-    autoprefixer-rails (6.2.3)
+    autoprefixer-rails (6.3.6.2)
       execjs
-      json
     awesome_print (1.2.0)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
@@ -191,7 +190,7 @@ GEM
     escape_utils (1.1.1)
     eventmachine (1.0.8)
     excon (0.49.0)
-    execjs (2.6.0)
+    execjs (2.7.0)
     expression_parser (0.9.0)
     factory_girl (4.5.0)
       activesupport (>= 3.0.0)
@@ -825,6 +824,7 @@ DEPENDENCIES
   asana (~> 0.4.0)
   asciidoctor (~> 1.5.2)
   attr_encrypted (~> 3.0.0)
+  autoprefixer-rails (~> 6.3.6)
   awesome_print (~> 1.2.0)
   babosa (~> 1.0.2)
   base32 (~> 0.3.0)

config/autoprefixer.yml

+browsers:
+  # Desktop
+  - "last 2 Chrome versions"
+  - "last 2 Edge versions"
+  - "Explorer >= 11"
+  - "last 2 Firefox versions"
+  # Mobile
+  - "last 2 Android versions"
+  - "last 2 ChromeAndroid versions"
+  - "last 2 ExplorerMobile versions"
+  - "last 2 FirefoxAndroid versions"
+  - "last 2 iOS versions"
+  - "last 2 Safari versions"