gemfile additions

Gemfile

@@ -1,19 +1,24 @@
 source :rubygems
 
+# external ruby libraries
 gem "uuidtools"
+gem "json"
+gem "antlr3"
+gem "hashie"
+
+# sinatra and related
 gem "sinatra"
 gem "sinatra-contrib"
 gem "sinatra-cross_origin"
+
+# passenger
 gem "passenger"
-gem "json"
-gem "antlr3"
-gem "hashie"
 
-group :ec2 do
+platforms :ec2 do
   gem "aws-sdk"
   gem "xml-simple"
 end
 
-group :development do
+platforms :development do
   gem "rspec"
 end