Adding Search Filters.

 - Sort by Date, Price, or Distance.
 - Specify Price range from 0 to 1000
 - Specify radius you want to search from current location. (Currently Faking the current Location)
 - Also saves filters settings between instances by storing them in SharedPref.
Updating filters settings after the new Refactor.
Merge pull request #74 from Hawk-It/search_filters

Search filters