Gem 'jekyll-press' compresses HTML, JS, and CSS files.

Gemfile

@@ -1,8 +1,9 @@
 source 'https://rubygems.org'
 
 gem 'jekyll', '~> 2.1.0'
-gem 'i18n'
 gem 'therubyracer'
+gem 'i18n'
+gem 'jekyll-press'
 
 group :development do
   # Automatically reload your browser when 'view' files are modified

Gemfile.lock

@@ -12,6 +12,10 @@ GEM
       execjs
     coffee-script-source (1.7.0)
     colorator (0.1)
+    css_press (0.3.2)
+      csspool-st (= 3.1.2)
+      json
+    csspool-st (3.1.2)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -30,6 +34,11 @@ GEM
       em-websocket (~> 0.5)
       guard (~> 2.0)
       multi_json (~> 1.8)
+    html_press (0.8.2)
+      htmlentities
+      multi_css (>= 0.1.0)
+      multi_js (>= 0.1.0)
+    htmlentities (4.3.2)
     http_parser.rb (0.6.0)
     i18n (0.6.9)
     jekyll (2.1.0)
@@ -51,10 +60,16 @@ GEM
       coffee-script (~> 2.2)
     jekyll-gist (1.1.0)
     jekyll-paginate (1.0.0)
+    jekyll-press (0.2.1)
+      html_press (>= 0.8.2)
+      jekyll
+      multi_css (>= 0.1.0)
+      multi_js (>= 0.1.0)
     jekyll-sass-converter (1.0.0)
       sass (~> 3.2)
     jekyll-watch (1.0.0)
       listen (~> 2.7)
+    json (1.8.1)
     kramdown (1.4.0)
     libv8 (3.16.14.3)
     liquid (2.6.1)
@@ -65,6 +80,10 @@ GEM
     lumberjack (1.0.9)
     mercenary (0.3.3)
     method_source (0.8.2)
+    multi_css (0.1.0)
+      css_press
+    multi_js (0.1.0)
+      uglifier (~> 2)
     multi_json (1.10.1)
     parslet (1.5.0)
       blankslate (~> 2.0)
@@ -91,6 +110,9 @@ GEM
     timers (1.1.0)
     toml (0.1.1)
       parslet (~> 1.5.0)
+    uglifier (2.5.1)
+      execjs (>= 0.3.0)
+      json (>= 1.8.0)
     yajl-ruby (1.1.0)
 
 PLATFORMS
@@ -100,4 +122,5 @@ DEPENDENCIES
   guard-livereload
   i18n
   jekyll (~> 2.1.0)
+  jekyll-press
   therubyracer

_config.yml

@@ -5,6 +5,7 @@ permalink: pretty
 destination: public
 exclude:     ['assets/vendor', 'Gemfile*', 'Guardfile', 'README*', 'vendor']
 keep_files:  ['.gitkeep']
+gems:        ['jekyll-press']
 
 encoding: UTF-8