Use Twitter 1.1 API for User Timelines

Twitter up and killed their 1.0 API, which I was pointing my
user_timeline call to. Apparently, the authentication was wrong, so I
had to patch it up to fetch again.

Need to make sure posting is okay (why wouldn't it be?) then I can
upload it home.
Fixed posting tweets.

Printing HTTP requests to stdout makes them unsuitable for sending in
the Go libraries. Cool side effects, bro.