Creating a Git repo causes errors

[sagebind]

Creating a new Git repository inside the current directory causes vcs to not function correctly until you change directories.

Example:

~ $ mkdir test
~ $ cd test
~/test $ git init
~/test $ vcs.root
fish: Unknown command 'vcs.root'

The errors are more intrusive if the current theme uses vcs to display info in the prompt.

[derekstavis]

Should be now fixed in 6d0cc9d