Project improvements (working in progress)

[thiamsantos]

As discussed on #9, I am adding some things on the project. I will appreciate any comment and review on this pull request.

TODO

• [x] Improve README
• [x] Improve contributor guidelines
• [ ] Implement tests
• [ ] Achieve 100% code coverage with tests
• [x] Add a code style
• [ ] Integrate with Travis CI
• [ ] Integrate with Coveralls
• [ ] Add cross-browser support test using Sauce Labs
• [ ] Add Git Hooks to prevent bad commits

[thiamsantos]

Thanks for merging :tada: :tada:

I will continue sending changes in another pull request.