Modified form button click selector. Fixes #63.
Added rails:attachBindings event to enable customization of binding selectors. Fixes #263.
Added ajax:send event to provide access to jqXHR object for ajax requests. Fixes #254.
Make crossDomain respect data-cross-domain=false on element. Fixes #232.
Detect and throw error when jquery-ujs is included in document more than once.
Use :checked for required checkbox and radio inputs. Fixes #236.
Disable form elements when form falls back to regular submit for file-fields. Fixes #231.
Fixed multiple-inclusion detection for when no event handlers bound to document.
Committing only the xhr changes.
Merge branch 'master' of git://github.com/bradphilips/jquery-ujs into bradphilips-master-rebased

Conflicts:
	src/rails.js
Added test back from bradphilips-master, slightly modified
Updated changelog
Added jquery 1.8.0 to test suite. Removed jquery 1.6.x support.
Fixed multiple-inclusion check for compatibility with jquery 1.8.
Fixed re-enabling elements when ajax:beforeSend returns false.

This worked in jQuery 1.6 and 1.7 due to what was considered a bug,
according to this ticket, which has been fixed in jQuery 1.8:

http://bugs.jquery.com/ticket/10944
Updated changelog and readme
Compare boolean values for non-blank file field to fire ajax:aborted:file. Fixes #271.
Re-enable form fields if ajax:aborted:file handler returns false.
Only require one required radio input in set to be checked.
Added support for jquery 1.8.1