Travis building/testing multi OS

[nunojusto]

WORK IN PROGRESS

Problem

Making Travis building/testing in Linux and OSX Solving https://github.com/CityOfZion/neo-local/issues/121

Checklist

• [x] I have ran the tests locally.
• [x] I branched off of the develop branch and not master.
• [x] I did not change the VERSION file.

[nunojusto]

No docker on OSX on Travis :( https://github.com/travis-ci/docs-travis-ci-com/pull/1185