Add basic background image support
Fix stylesheet method name
Add background-color support
Add test for background color parsing
Add fillRectangle to drawOn to draw background-color
Add background-repeat support
Merge branch 'master' into rendering/background

Conflicts:
	packages/HTML.package/StyleResolver.class/instance/cssPrefixMap.st
	packages/HTML.package/StyleResolver.class/methodProperties.json
	packages/HTML.package/monticello.meta/version
Make background images fixed
Optimize for Google (spikes for bg-position, width, height attrs)
Tests and cleanup
Bugfix
Merge branch 'master' into rendering/background
Fix stylesheet URL resolving and ignore inline image data
Resolve canvas hack
Merge pull request #112 from SWTI2014/rendering/background

Fix #83: CSS background colors and images