CI build, distribution, and badges

[yurishkuro]

There is no Travis config, I assume the unit tests are not run automatically on pull requests. Can the Travis build be set up?

I don't know how PHP modules are usually distributed, is there some repository (like npm, pypi, Maven) where the module is packaged and distributed? Or do people always import it directly from GitHub? If there is a repository, please document it in the README.

Please include badges in the README for the Travis build, latest release version of the module, and the repository (if available).

[jukylin]

Done v2.0.9-beta