Update jQuery to 1.9.1 and add jQuery migration plugin – closes #1610

The 1.9 and 2.0 APIs are the same, so we should be able to drop in 2.0 as soon as it is released.
Switch from .attr('selected') to .prop('selected')
Merge pull request #1652 from nilshoerrmann/jquery

Update jQuery to 1.9.1