* More mappings for different types of :cd
+ <cr> change the local working directory inside ctrlp.
+ <c-t> change the global working directory. (exit ctrlp)
+ <c-v> change the local working directory for the current window. (exit ctrlp)
+ <c-x> change the global working directory to |CtrlP|’s current local working
directory (exit).
* Some clean up.