added the functionality to change the zip codes that are allowed when submitting a job request.
removed unneeded code.
Updated the functionality of adding zip codes to do all verification on the server side as well as simplifying the input interface to taking just a comma separated list.

Fixed a bug in the staff route for adding jobsites. When adding a jobsite a staff member is taken to the review page. The id of the new jobsite was being returned as undefined.
Merge pull request #14 from justin3rd5Auburn/master

Zip Codes