Adds search by name functionality

* Adds methods to find by last name, convert to id, then return user objects
* Adjusts _show partial to only reflect name search or location search

![](http://38.media.tumblr.com/221f71cf031bbdb2973d679c9f5a1b81/tumblr_mkqle3QaIc1s99m4bo1_400.gif)