Fix which with virtualenvwrapper_lazy.sh

`command \which` is used in virtualenvwrapper.sh, and it fixes an
infinite loop, because VIRTUALENVWRAPPER_SCRIPT is not being setup
correctly.

In my zsh setup:

    % which virtualenvwrapper.sh
    sh: suffix aliased to zsh-mime-handler
    % command which virtualenvwrapper.sh
    /usr/local/bin/virtualenvwrapper.sh

An alternative might be to use `which -p`, but that is probably zsh-only
(not portable).

Author: blueyed

virtualenvwrapper_lazy.sh

@@ -5,7 +5,7 @@ export _VIRTUALENVWRAPPER_API="$_VIRTUALENVWRAPPER_API mkvirtualenv rmvirtualenv
 
 if [ -z "$VIRTUALENVWRAPPER_SCRIPT" ]
 then
-	export VIRTUALENVWRAPPER_SCRIPT="$(which virtualenvwrapper.sh)"
+	export VIRTUALENVWRAPPER_SCRIPT="$(command \which virtualenvwrapper.sh)"
 fi
 if [ -z "$VIRTUALENVWRAPPER_SCRIPT" ]
 then