Add mail to Travis

[joshk]

Hey Guys,

This pull request only adds a .travis.yml file, and still requires @mikel to add the mail gem to Travis.

I added my fork and can replicate the 1.9.3 failure which Rails is experiencing.

Here is what the current mail tests look like : http://travis-ci.org/#!/joshk/mail

Let me know if you have any questions.

Thanks,

Josh

[mikel]

Thanks :) Merged and implemented on travis