CSS to SCSS (#1247)

* CSS to SCSS

* Fix travis

* Use sprockets

* Use Sprockets helpers

* Fix gollum.editor.js error when changing language

* Fix fileview styles, use same style as Pages View.

* Add keybinding files required by ace and some ace ext files that are required or might be useful.

lib/gollum/views/helpers.rb

@@ -0,0 +1,35 @@
+require 'yaml'
+
+module Precious
+  module Views
+    module SprocketsHelpers
+      def self.included(base)
+
+        def helper_proc_with_options(method)
+          Proc.new do |args|
+            args = args.split(' ')
+            if args.size > 1 then
+              options = args[1..-1].join(' ')
+              options = YAML.safe_load("---\n#{options}\n", [Symbol])
+            end
+            options = options.respond_to?(:to_h) ? options.to_h : {}
+            options = options.inject({}){|memo,(k,v)| memo[k.to_sym] = v; memo}
+            send(method, args[0], options)
+          end  
+        end
+
+        ['stylesheet_path','javascript_path', 'image_path'].each do |method|
+          define_method :"#{method}_mustache" do
+            Proc.new {|args| send(method.to_sym, args)}
+          end
+        end
+
+        ['stylesheet_tag','javascript_tag'].each do |method|
+          define_method :"#{method}_mustache" do
+            helper_proc_with_options(method.to_sym)
+          end
+        end
+      end
+    end
+  end
+end