Upgrade jquery from 1.11.0 to 1.11.1

Changelog here: http://blog.jquery.com/2014/05/01/jquery-1-11-1-and-2-1-1-released/
Meteor apps won't warn about deprecated `getPreventDefault` again!

To verify that I haven't corrupted the file you should run the following and check that the two checksum correspond:
```sh
$ curl -s http://code.jquery.com/jquery-1.11.1.js | shasum && cat packages/jquery/jquery.js | shasum
```