Added closure-compiler JS compression support

Author: Kyle Kirkby

Gemfile

@@ -3,6 +3,7 @@ source "https://rubygems.org"
 gem 'jumbo-jekyll-theme', "6.0.0.1"
 # Jekyll Plugins
 group :jekyll_plugins do
+   gem "closure-compiler"
    gem "nokogiri"
 end
 # # Windows does not include zoneinfo files, so bundle the tzinfo-data gem

_plugins/japr.rb

@@ -0,0 +1,14 @@
+require 'japr'
+
+class JavaScriptCompressor < JAPR::Compressor
+  require 'closure-compiler'
+
+  def self.filetype
+    '.js'
+  end
+
+  def compress
+    closure = Closure::Compiler.new(:language_in => 'ECMASCRIPT6')
+    return closure.compile(@content)
+  end
+end