BUG: Javascript Error in Tasks

https://trello.com/c/M1cOBrE4

This fix removes 'bootstrap' module dependencies from
angular app modules. Required due to removal of
angular-bootstrap.js:
http://review.motechproject.org/#/c/3544/

Change-Id: Ifb1714531c0bb11c59b1de6071c15ea9abd1c936