initial commit
blocking server realization
added an ability to extend default rpc error object, better client-side error handling
logback config added
style
todo
server-side exception protobuf improvements
socket operation listeners added
logback config removed
javadoc fix
migrated to slf4j-logging
style fixes
blocking client realization
request timeout support for client, refactoring
proto file moved to main/proto
client options
Merge remote-tracking branch 'protobuf-rpc/master'
global: protobuf-rpc project imported

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>