install bower_components in root directory

/app should only have user created/editable files. Bower should install
its files alongside npm's.

Fixes #171
Fix Bower include paths
Exclude the Bootstrap JS file on LESS Bootstrap too
Fix Glyphicons copy path for LESS Bootstrap
Update grunt-usemin to stop creating broken links

:notes: You can't play on broken links... :notes:

Fixes #242
add missing semicolons

Closes #310
Merge pull request #311 from silvenon/vendor

Update grunt-usemin to stop creating broken links