Update supported versions Improve doc generation
Update elixir version requirment to at least 0.15.0
* Require at least Elixir 0.14.1 * Fix Travis support
* Docs * Hex support * Travis support
* Improve reseting of tracer * Make API more consistent * Improve trace message printing * Add Tests
Elixir 0.14.0 and 0.14.1 compatible release