Add travis files

Signed-off-by: John Else <john.else@citrix.com>
Fix build for OCaml 4.00.1

Signed-off-by: John Else <john.else@citrix.com>
Update README.md

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #7 from johnelse/travis

Add travis integration