support stream
add buffer support and fix test
Merge pull request #1 from dead-horse/stream

Upload support buffer and stream.
Release 0.1.1
only support node@0.8.0+
Release 0.1.2
use blanket instead of jscover
refresh servers every 10 minutes. fixed #2
Release 0.1.3
update readme events
fixed #3 update readme
fixed #3 update readme
update daily host; fixed deps version
Release 0.1.4
add diagnose tools link
add test usage for test env
fixed upload buffer directly bug
Release 0.1.5
upgrade urllib version
try to guess content-type and extention when extname missing