Remove superfluous line
Trigger update on hub commands as well
Add gh command

This is to fix an issue in
https://github.com/olivierverdier/zsh-git-prompt/pull/30#issuecomment-26727414
Merge remote-tracking branch 'paulcollinsiii/master'
add stg to triggering command list
Merge remote-tracking branch 'upstream/master' (syncing fork).