Fixed image test for slimerjs
Fix isolated svg color tests so 'rgb()' colors are accepted
Make notebook tests play nicely with SlimerJS
- notebook/dualmode_markdown.js
- notebook/safe_append_output.js
Make int widget tests play nicely with slimer
Fix for xvfb SlimerJS environment.
Some cleanup
Make a nice assert function for properly testing locale specific colors.
Moved is_cell_rendered into base
Add slimerjs flag to test engine.

Conflicts:
	IPython/html/tests/util.js
Fixed spaces in ipcontroller

Conflicts:
	IPython/testing/iptestcontroller.py