Disable keep-alive connections.

If there are a sufficient # of connections opened/file descriptors exceeded, Camo will start returning back 404
because of the saturated number of connections.
Merge pull request #70 from rogerhu/keep_alive

Disable keep-alive connections.
don't require path twice
Merge pull request #71 from jdreesen/patch-1

Don't require path twice
update the js file
release version 2.2.0