Fix Content-Length using Buffer
Merge pull request #29 from berryboy/master

Use Buffer for calculating Content-Length. #29
fixed global leak of variable key
Merge pull request #31 from mypark/master

Fixed global leak of variable key. #31
Put body in resp.body as well as third callback argument.
Specs, 0.5.7
Fixed global leak.
0.5.8
Only output to file on 200 response.
0.5.9
Update README.md
Update README.md
Merge from source
Merge branch 'master' of github.com:inDream/needle