locate: added basic command
Note: This is still WIP (consider it this commit as a pre-alpha release)
vim: first binding of locate command
locate: bugfix
locate: search for type declarations as well
makefile: tell ocamlbuild to generate cmt files.
protocol.md: updated with 'locate' command
locate: added "at pos" version
emacs: locate command.
emacs: Fixed stack of locate.
emacs: Fixed bug in `merlin-locate'.