adds a deployment step for github
adds a deployment step for github

* should provide an auto-generated demo apk

NOTE

* travis setup --org -r synyx/calenope releases
** username and password required for the setup, should encrypt the api key

* https://docs.travis-ci.com/user/deployment/releases/
* http://szagurskii.com/blog/how-to-deploy-apk-to-github-releases-with-travis-ci/

synyx/calenope