Reverting to grpc 1.3.0
Reverting to grpc 1.3.0

There was a bug in 1.4.0-SNAPSHOT that needs to be fixed.
kevinsi4508/cloud-bigtable-client,googleapis/java-bigtable-hbase,googleapis/java-bigtable-hbase,kevinsi4508/cloud-bigtable-client,sduskis/cloud-bigtable-client,googleapis/java-bigtable-hbase,sduskis/cloud-bigtable-client