add color picker
hook up fore-color to toolbar
add back-color
Rough implementation of modules and themes

Home for advanced demo's styles and custom color picker / dropdown.
Current commit state is grunt compiles and files are loaded. Couple
features are disabled for the time being.
move focus checking to renderer
Merge branch 'develop' into color
fix index demo
add ability to include external stylesheet
fix css for buttons
memoize addStyleSheet
add image back
add some styles
dropdown style and behavior implemented
fix infinite loop, code cleanup
fix bugs in picker
use divs instead of ul/li
extend picker for color picker
polish up color picker
remove dropkick
fix stuff temporarily for demo