Update for trunk
Merge pull request #28 from whitequark/trunk

Update for trunk
Merge pull request #26 from samoht/trunk

Add a META file to make ocamlfind happy
added camlp4/META to .gitignore
rename LIB to PKGDIR to match LIBDIR and BINDIR
Allow to specify LIBDIR, BINDIR and PKGDIR at configuration time

Would be better to rewrite all the configuration scripts from scratch, but well ...