Merge pull request #17 from chen3feng/develop

Develop
Merge pull request #18 from chen3feng/develop

Develop
Refactoring
check code style using cpplint before blade build/test
fix code style, make cpplint.py configurable
don't launch cpplint process if no files are changed
fix code style
Merge pull request #24 from yeshunping/master

check code style before blade build/test
Fix blade with cpplint