Adding GAX classes#320

Merged

aozarov merged 2 commits intogoogleapis:pubsub-alphafrom

garrettjonesgoogle:pubsub-alpha

Nov 4, 2015

Commits on Nov 3, 2015

Adding GAX classes
garrettjonesgoogle
committed

Commits on Nov 4, 2015

Adding implicit dependency, using constant instead of hardcoded string
garrettjonesgoogle
committed