Removed rgbapng dependency, fixed font-unit error
Merge branch 'master' of ssh://assets-zanata.rhcloud.com/~/git/assets

# By Alex Eng
# Via Alex Eng
* 'master' of ssh://assets-zanata.rhcloud.com/~/git/assets:
  Fix ajax loading bar's visibility
  Add missing font-size
  Append last commit: add style for 'Report problem' link in error page
  Add style for 'Report problem' link in error page
  Remove max-width for content div
  Remove sass cache folder
  Add mock error page and css
  Added style for disabled input button
  Update README.md

Conflicts:
	php/dev/assets/css-sg/style-old-ie.css
	php/dev/assets/css-sg/style.css
	php/dev/assets/js/script.js
	php/dev/assets/js/script.min.js
	src/assets/css-sg/style-old-ie.css
	src/assets/css-sg/style.css
	src/assets/js/script.js
	src/assets/js/script.min.js

And fixed header title
Added better error alerts styles. Can refine/extend next release.