Enables continuous integration using travis.

I posted this: https://groups.google.com/forum/#!forum/skulpt on the group. And this seemed a good one to start with.

adds a new x64 build of v8
and some scripts for travis-ci and to build a new version of v8 by travis-ci

@bnmnetp you need to signup for travis and go to your profile https://travis-ci.org/profile and switch the skulpt repository on.

It will build after the next push.