Reverting most of the fancy prompt.

It was causing some weirdness when you pasted to the command line.

Also removing the git_command setting since it seems to cause problems from time to time (like when setting up ST2 on my MacBook Air). Leaving it to its default seems to do the job. I'm going to keep my eye on this, though. Seems that our friend @zenworm has been having problems with this as well. https://github.com/kemayo/sublime-text-2-git/issues/96#issuecomment-11582739