Add html2js grunt task

Load html partials into a module which load them
into the template cache.

ref https://github.com/karlgoldstein/grunt-html2js
Fix watching for partial change
add scBoxPlot directive

ps: in the process other charts are temporary 
disabled.
add directive for scGroupedBoxPlot
Update angularjs
Add scBar directive
Add scPie directive
Check template-module in
Merge pull request #10 from dinoboff/master

Adding unit test for each chart