use sass for jammit css compression, no more java!

jammit can use sass to minify css.  this is great
because now we don't need the yui-compressor.
which means that we don't need java.

Change-Id: I22d0f35340077a866ffe1000443bc5a061a9e613
Reviewed-on: https://gerrit.instructure.com/11588
Reviewed-by: Cody Cutrer <[email protected]>
QA-Review: Cody Cutrer <[email protected]>
Reviewed-by: Jacob Fugal <[email protected]>
Product-Review: Bryan Madsen <[email protected]>
Tested-by: Jenkins <[email protected]>

Gemfile

@@ -40,7 +40,7 @@ gem 'hashery',        '1.3.0',  :require => 'hashery/dictionary'
 gem 'highline',       '1.6.1'
 gem 'i18n',           CANVAS_RAILS3 ? '0.5.0' : '0.6.0'
 gem 'icalendar',      '1.1.5'
-gem 'jammit',         '0.6.0'
+gem 'jammit',         '0.6.6'
 gem 'json',           '1.8.0'
 # native xml parsing, diigo
 gem 'libxml-ruby',    '2.6.0',  :require => 'xml/libxml'
@@ -77,8 +77,6 @@ gem 'useragent',      '0.4.16'
 gem 'uuid',           '2.3.2'
 gem 'will_paginate',  '2.3.15'
 gem 'xml-simple',     '1.0.12', :require => 'xmlsimple'
-# this is only needed by jammit, but we're pinning at 0.9.4 because 0.9.5 breaks
-gem 'yui-compressor', '0.9.4'
 gem 'foreigner',      '0.9.2'
 gem 'crocodoc-ruby',  '0.0.1', :require => 'crocodoc'
 gem 'regru-premailer', '1.7.7', :require => 'premailer'

config/assets.yml

@@ -1,7 +1,6 @@
 embed_assets: off
 gzip_assets: off
-css_compressor_options:
-  line_break: 0
+css_compressor: 'sass'
 
 # if you want use IE in dev mode and want to get around the max of 30 stylesheets
 # problem, uncomment the following lines and make sure you