Add _lp_python_env() and _lp_python_env_color()
Add _lp_python_env() and _lp_python_env_color()

I can't find any explaination why the environments were trunkated to the
last '/'. I could use some people not wanting a long string in their
prompt, but I'm sure others want the whole original string.

jaesivsm/liquidprompt,laurentbardin/liquidprompt,nojhan/liquidprompt,pkkolos/liquidprompt,milouse/liquidprompt