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
Refactors user model and searches controller to combine methods

* Now one method to search by text, retrieve id, then search for id to return
* objects
Removes id_search method
Merge pull request #9 from Psychologist-Today/search_by_name

Adds search by name functionality