Suggestion for CI integration

Regarding issue #10

This is just suggestion, and you would have to do few additional things.
 
* register and enable [Travis](https://travis-ci.org/ fpr) this repo (rather painless process)
* probably reduce number of erlang versions (to you liking)
* introduce test script 
   
In my version I only compile code, which is good enough. But since there are some tests that could be run, they should be run.

I'm not advertising anything, but for such small repo it just seems reasonable to use Travis.