Make It Official

This is a ~~work-in-progress~~ pull request that makes canon-bootstrap a little bit more official. Until now, it has been @ericmcgregor and I experimenting with a Bootstrap skin. Now that we have a handful of teams (Cloud Intelligence, Mailgun, MyRack) bought into the idea, it is important to stabilize the project and enforce standards. Here's what I've attempted to accomplish with this pull request:

- [x] Make the project public.
- [x] Add a license (MIT) to the project.
- [x] Add project status and usage instructions to the README.
- [x] Add CONTRIBUTING.md to give guidelines for code style and the contribution process. 
- [x] Sets up continuous integration with Travis CI. Currently, this simply makes sure the project builds. In the future, we might add other scripts such as [bootlint](https://github.com/twbs/bootlint) to enforce coding standards.

Assuming this looks alright, I'll go ahead and cut a release for v0.1.0.

Closes #24.