Implement the option to 'unstuck' a bottom bar

I've implemented the patch from
https://github.com/imakewebthings/jquery-waypoints/issues/172 as
coffeescript.

Works well for my application and tests still pass (though I've add no new tests for this functionality)
Merge branch 'master' of github.com:ideasasylum/jquery-waypoints into 192-merge
Cleanup and document the direction option for sticky shortcut, #192
#207, make infinite shortcut destroy/recreate instead of disable/enable
#225, make unsticky nondestructive if called on nonsticky element
Fix infinite shortcut, Chrome fixtures still hosed
Fix Infinite tests in Chrome
#253, moved options cloning to occur before handler assignment
#260, remove More link when infinite shortcut reaches end
#262, use window instead of this, allows Browserifyication
#272, remove stray references to GPL license
#283, stop using deprecated jQuery load method
Protect license comment with ! for uglify

Signed-off-by: Mathieu Doyon <mathieu.doyon@studiofrenetic.com>
Update changelog, version references for 2.0.5 release