Merge pull request #2 from xtao/gh_ghttpserver

WIP: Add ghttpserver
update requirements
clear
refactor
bugfix
support file import
use realpath to get host key
update README
as tonic said
Could not find a version that satisfies the requirement gevent==1.1
fix git dir on http mode
Merge pull request #1 from tclh123/dev

fix git dir on http mode