- added code from #2001 thanks @CoderSquirrel

Closes #1854 & #2001

- updated ControlSidebar.js to hide control sidebar instead of only moving it
- updated dashboard.js to use containment in sortable()
- added display none to control sidebar content in index.html

(Closes #1924)

Fixing bug throwing error "Uncaught ReferenceError: expandingEvent is not defined" when collapsing .box .

* issue1976

* issue1976_grunt_js

* fixed content-wrapper height

* updated content wrapper height