To get the name of the current checked out tag the gitstatus.py script
calls `git log -1 --format="%h%d"`. Ordinarily this will output
something similar to `(HEAD, tag: foo)`. Then the regex grabs
everything from `tag:` to the closing `)` and then drops the last
character to give the tag name. This causes a problem when the current
tag is equal to another tag or branch and the output looks like this:
`(HEAD, tag: foo, origin/master)` and the tagname gets set to
`tag: foo, origin/master`. This breaks the whole script because its
output is space delimited and GIT_AHEAD which is supposed to be an
integer gets set to `origin/master` (branch also get set to `foo,`
instead of `foo`, but it's not as big of a problem). To fix this we
change the regex to be nongreedy so that it will only grab one item from
the list and let the closing match either `, `(comma space) or `)`. We
also have to use a lookahead since we can't just drop 1 character (`, `
is 2 characters).
