Add base service option classes for gRPC and HTTP services#1011

Merged

mziccard merged 2 commits intogoogleapis:pubsub-alphafrom

mziccard:pubsub-service-options

May 16, 2016

Commits on May 15, 2016

Add base service option classes for gRPC and HTTP services
mziccard
committed

Commits on May 16, 2016

Rename ExecutorProvider to ExecutorFactory, refactor shutodown and serialization
mziccard
committed