create shared URL cache
add NSURLCache
check last-modified header in http response
doesn't make decision about caching yet - just gets information
sort station results array by number of available bikes (descending)
Add google nav test controller
Modify google nav test controller to include button that leads to open Google app
Add google nav test scene
Merge pull request #27 from fma2/google-navigation

Testing out google navigation
make http request on app load
create station object, add nsurlcache to appdelegate header
not using station object yet - may need to remove this later
add nsurlcache to appdelegate
trying to force response to cache without cache-control header

headers (via curl -i http://www.citibikenyc.com/stations/json)
----------
HTTP/1.1 200 OK
Date: Tue, 19 Aug 2014 03:07:30 GMT
Server: Apache/2.2.15 (Red Hat)
X-Powered-By: PHP/5.4.30
x-version: 1.0
Last-Modified: Tue, 19 Aug 2014 03:07:01 GMT
Vary: Accept-Encoding,User-Agent
Connection: close
Transfer-Encoding: chunked
Content-Type: application/json
----------
Modify direction stringing --ready to be used in app!
CACHE STUFF CACHE STUFF CACHE STUFF
also delete unnecessary code (commented it out & functionality didn't change)
also NSLog disk usage - WORKING
fix spacing
sort by number of bikes
might have had this functionality already
deleted and re-did a lot
it's here now
latest attempt at caching
N.B. revert changes to storyboard ASAP
make cacheAndLoadStations instance (as opposed to class) method
Merge pull request #28 from fma2/google-navigation

Link parsed with hard-coded lat and long - ready to be tested on device
no longer putting location coordinates on the heap
change rewind button to cancel
rewind was confusing