port high performance implementation of hash algorithms
revert "port high performance implementation of hash algorithms"

This reverts commit 6e802a3c6f46c8e4fb46ea0799c6ba971e651699.
implement json format for google protobuf
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 pull request #52 from chen3feng/develop

Develop
Merge pull request #54 from chen3feng/develop

Fix typo
Merge pull request #55 from chen3feng/develop

Replace Chinese comments to English in thread.h
Merge pull request #56 from chen3feng/develop

Add unordered containers
Merge pull request #57 from chen3feng/develop

Cleanup base/string
Merge pull request #58 from chen3feng/develop

Remove Thread::Initialize, fix unique_ptr::reset
Merge pull request #60 from chen3feng/develop

Develop
Add Process class