add sort by distance ascending

- set default of no sort to be sort by distance ascending
- changed distance header to be link
- change javascript to handle click of distance sort to remove sort
param from javascript and params
- reordered search controller to persist within searching and distance
sorting as well as other searching and sorting
- add reverse geocoding to courts via location association
Merge pull request #7 from merhard/distance_sorting

add sort by distance ascending