Modified InstagramEngine to use AFNetworking 2.0
changed radius param to distance in /media/search

changed radius to distance to match IG “/media/search” endpoint
Removed hardcoded callback_urls

Removed hardcoded callback_url in addSubscriptionForXXX methods
Merge branch 'master' of https://github.com/felixmo/NRGramKit

Update to felixmo branch to update to AFNteworking 2.0.
ignore local dev podspec