[PATCH] Multiple Improvements to UJS Drivers

Brief summary of changes:

Prototype - http://github.com/qhoxie/prototype-ujs
4b8ae92 Remove event.element() in favor of event.findElement()
5a06bee Treat data-remote as a boolean attribute in selectors
339aa6a Only support href as url on non-form elements

jQuery - http://github.com/qhoxie/jquery-ujs
be329c5 Whitespace consistency
b17c7bb Only create csrf input if the data is provided
16363f7 Simplify metadata inputs to strings and a single call to append()
0999420 Treat data-remote as a boolean attribute in selectors
5ae3f93 Better symmetry in negation of data-remote selector
2e8f578 Utilize dataType option to manage Accept header
de7011f Throw exception if no url is provided in the remote call

Diffs are attached. I can break them out if necessary.