[GCI Task] Funds Integration Test Suite

This branch adds the integration test suite for the funds API.

This was done as part of:
https://www.google-melange.com/gci/task/view/google/gci2014/5211114522542080
https://www.google-melange.com/gci/task/view/google/gci2014/6399417955385344
https://www.google-melange.com/gci/task/view/google/gci2014/6385735531757568