Prevent overflow of comment code in event body. Add border-radius to highlight code inside note body

This unifies the code color-scheme code and makes
adding new schemes a little easier.

Created tests and refactored some code along the way

Added stat graph util spec, refactored code

finsihed up tests and refactors

finsihed up tests and refactors

The cross 'move' cursor doesen't work if you can't it around.
refs #3741

Assigning the background color to the pre tag did not work correctly. Moved background color to the highlight class which fixes the problem.

fix #3823

update jquery-atwho-rails to v0.3.0

add autocomplete_source action to project for gfm autocomplete

move init_autocomplete layout from head_panel to project_resource