Add HttpClient
Refactor HttpClient
More refactoring
fix unittest failure
port md5
implement json format for google protobuf
Merge pull request #26 from yeshunping/test_fix

fix unittest failure
Merge pull request #25 from chen3feng/develop

Develop
fix code style, add two new interfaces
change file name, Log starts with Upper case
fix code style
Merge pull request #32 from yeshunping/json_format

Json format implementation for protobuf
move include path for protobuf to source file
Merge pull request #53 from yeshunping/json_format

move include path for protobuf to source file
Merge branch 'hash'
Merge branch 'md5'
implement benchmark_main library for cc_benchmark
port benchmark from re2, and refactor code for it
refactor hash code, write benchmark for them