Application form updates

This PR is a rollup of several enhancements and updates based on user feedback. Pending changes from Abby's feedback which Ehud is reviewing as I open this.
On Wed, Aug 20, 2014 at 04:21:17PM -0700, Brian Sadler wrote:
> Did you get a chance to have a look at the call to format.xls in the users_controller?

I just took a look at it... it uses a method from a gem, not sure how to customize/format the data, but after installing it, it did make a working xls file and seems easy to use elsewhere.

I'll try using it here too, looks cool.