Cleaning up rpckit_stubs.cc
Cleaning up rpckit_http_proxies.cc
Cleaning up rpckit_http_servlets.cc
Add a couple more protobuf checks to configure.ac
Extract http proxies generator
Extract servlet generator.
Extract rpckit_stubs_generator
Add protoc-gen-rpckit
Don't use colon for option delimiter
Use simpler rpckit plugin in gradle example