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The context may be cancelled while a request is in flight. We need to
handle this and cancel the request. The code is based on the ideas
from https://blog.golang.org/context

- Modified Godeps/Godeps.json by hand
- [TEST] Updated welcome docs hash to sharness
- [TEST] Updated contact doc
- [TEST] disabled breaking test (t0080-repo refs local)

squash! commands: Added Length field to Response

commands/http: client: Fixed error on unset length

we've gotta allow the code to speak for itself. I wouldn't have been
able to safely modify this code without having my hand held. I am but a
lowly programmer with a simple mind.

cc @jbenet @whyrusleeping @mappum

commands/http: Don't set Content-Type for stream outputs so browsers can MIME-sniff the actual content type