Restructuring Dashboards, and adding ability to search for foodtypes and/or
borough

*Changed zipcode to string in database
*added link for admin dashboard in layout (no restrictions yet)
*changed current dashboard to be admin dashboard
*added user dashboard, now the root
*added a searches controller
*Added a quick search where you can search for a keyword in city, zipcode, or
agency name
*add ability to search for zipcode and/or city
*Added ability to add countless search fields in the future
*split search up into searches and filters controllers
*Refactoring method of advanced search
*Whitelisting parameters instead of blacklisting unwanted ones.
Merge pull request #2 from katherinlaine/ks-allow-user-to-search

Allow user to search for agencies