Change submodule URLs to HTTPS to avoid firewalls
Add OHHTTPStubs to test targets
New API for OVCRequestOperation
Make OVCMultipartPart immutable
New API for OVCClient
Update OVCClient tests
Update OVCSocialClient
Remove OVCQuery
Remove OHHTTPStubs from root directory
Re-add OHHTTPStubs under OvercoatTests
Merge pull request #3 from gonzalezreal/improve-client-api

New OVCClient and OVCRequestOperation interfaces