1.1.0 release

Feature

• Add contex support , put tarscurrent in context,for getting client ip ,port and so on.
• Add optional parameter for put context in request pacakge
• Add filter for writing plugin of tars service
• Add zipkin opentracing plugin
• Add support for protocol buffers

Fix and enhancement.

• Change request package sbuffer field from vector to vector
• Fix stat report bug
• Getting Loglevel for remote configration
• Fix deadlock of getting routing infomation in extreme situation
• Improve goroutine pool
• Fix occasionally panic problem because of the starting sequence of goroutines
• Golint most of the codes