Add i interface of HttpHandler and HttpServer
Merge pull request #59 from chen3feng/develop

Develop
Merge branch 'master' into http-server
Merge branch 'master' of https://github.com/chen3feng/toft into http-server
Merge branch 'master' of https://github.com/chen3feng/toft into http-server
Add event_dispatcher
cpplint
http server working on
Merge branch 'master' into http-server
Fix bug of infinite notify when client closed.
Merge branch 'master' into http-server
Merge branch 'master' into http-server
Merge branch 'develop' into http-server
Merge branch 'master' into http-server
Adjust sir structure of http
Merge branch 'master' into http-server

Conflicts:
	net/http/response.cpp
Merge branch 'master', remote-tracking branch 'origin' into http-server
Add tests for thread pool
Add bitwise_cast
Merge branch 'master' into http-server