Do not load if $TERM is not valide (fixes #161)
Shorten path: fix escaping on both bash and zsh

Thanks to polyphemus (Rolf Morel) for the catch!
Merge branch 'develop' of github.com:nojhan/liquidprompt into develop

* 'develop' of github.com:nojhan/liquidprompt:
  Shorten path: fix escaping on both bash and zsh
  Do not load if $TERM is not valide (fixes #161)