Make the modal implementation follow the spec of bs: http://getbootstrap.com/javascript/#modals-usage
Now, body gets "modal-open" class when a modal is opened, which fixes the scrolling issues.
Updates to Growl Notifications
 * the object is removed from the content array on timeout or close
 * the collection view takes care of removing the item view (cleans up the dom)
 * changed notification binding to be two-way, so when content is removed from collection-view, the GrowlNoticficationManager.notifications array reflects the same list.
 * cleanup regarding the comment I made to issue #36 and also implements the PR #53
Revert "Make the modal implementation follow the spec of bs: http://getbootstrap.com/javascript/#modals-usage"

This reverts commit 7f0739a0c9bde0dbf65f1bcb9d16372899a4c22a.
Merge pull request #63 from mspisars/growl-tweaks

Growl tweaks