only stop prop on form – as people seem to be relying on dropdown hiding when clicking internal elements

remove trailing semicolons - we'll be hosting minified files with semicolons - no reason to make the dev source ugly

See https://gist.github.com/1258742 for an example, which results in the error

"TypeError: Object has no method 'dropdown' at bootstrap-dropdown.js line 31"

It looks like in these circumstances, the functions hooked into
jquery.ready get run immediately, and so applying the dropdown
behavior to specific elements before defining the 'dropdown' method
causes breakage.