Spike removing AFNetworking

WIP

Finish removing AFNetworking
Fix broken tests
Remove commented stuff from VENCoreSpec
Add tests for VENHTTP
Use CMDQueryStringSerialization
fix broken tests
Fix integration tests
fix broken tests
fix brace
Remove OHHTTPStubs
Merge branch 'master' into remove_afnetworking

Conflicts:
	Podfile.lock
make query parameter tests less brittle
Merge pull request #17 from venmo/remove_afnetworking

Remove AFNetworking