Use delegation for bulk message actions.

This ensures that items added after AJAX actions are available for AJAX
deletion.

See #5070

Props imath

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7412 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Uncheck message checkbox in interface after deletion

The deletion UX only hides the message - doesn't remove it from the DOM - so
we have to make sure it's unchecked, or it'll mess up the next request.

See #5070

Props imath

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7413 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Whitespace

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7414 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Remove element selectors from bp-default

Fixes #5070

Props imath

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7415 cdf35c40-ae34-48e0-9cc9-0c9da1808c22