Add Travis files.
Remove testing of 4.00.1

    See https://github.com/ocaml/opam2web/issues/119#issuecomment-53651058
Fix installation target in Travis, and test installation by trying to link
Comment-out the compilation of O2wProject as this is not merged yet
Try to fix the Travis script for OCaml=4.02
Merge pull request #120 from samoht/master

Add Travis files.