Testing

I've added some base setup for testing. I created one simple test for the JsonStorageProvider and also added Travis CI config so you can automate the testing whenever the repo is pushed. Tests against 5.3+ and also hhvm which passes as well. hhvm is a minor concern but interesting to test against.

https://travis-ci.org/codenamegary/PHP-DNS-SERVER

Lots more tests to add, but the base is there now with a simple bootstrap so that we can just start adding more and more tests.