Merge pull request #3 from sagotch/master

Various fixes (see comment)
Add travis CI support
Add travis CI support
Add travis ci support (2)
Add travis support (3)
Add travis CI support (4)
Add travis CI suport (5)
Add travis CI support (6)
Add travis CI support (7)
Add travis CI support (8)
Add the stravis status in the README.md
To.ml needs Ocaml 4.0 at least 

This is caused by the use of Scanf.unescape in src/tomlex.mll at line 47.

Ocamlbuild is not anymore a dependency as it's packaged with Ocaml 4.