`z -c` in zlua

[owenstake]

Please fulfill the z -c in zlua. z -c means cd to the match dir in current pwd.

[xuwei152]

I also think this is a good feature that has been implemented in the wting/autojump program, too. It will be convenient when we want to jump to a subdirectory of the current directory but another directory also contains a directory with a similar name.