Configure Travis CI build

[kytrinyx]

@etrepum I'm in the process of extracting all the exercises, putting each language in its own repository.

I'm creating a separate api (http://github.com/exercism/x-api) which includes all the language repositories as git submodules.

Do you have time to set up the Travis build for the haskell repository?

[etrepum]

Sure, I'll make some time for that today

[etrepum]

I don't think I have sufficient access to set up the webhook with travis (may need owner for the repo), but I have something in the travis-ci branch that should work. I'll try forking it to my own acct and see if it works there.

[etrepum]

It's set up and works in my repo, but it doesn't look like the web hook is firing for your repo. Might need travis to be configured.

[kytrinyx]

I'll configure the web hooks, thanks!

[kytrinyx]

Done. And it passed! https://travis-ci.org/exercism/xhaskell