Set up Continuous Integration

[platisd]

Description

As an open source developer considering to continue the project I would like to know my contributions do not break the current system and I can always have the latest master release in an installable form so that I can verify the system on my own hardware.

Acceptance Criteria

• CI (preferably using TravisCI) is set up
• CI runs automatically for every new pull request
• At least two layers/components of the system are compiled succesfully on CI
• At least one layer/component of the system is released in an installable form (e.g. .apk for Android applications or .hex for Arduino sketches).

Useful resources

• DIT112-V19 groups with succesfully implemented CI
• Publishing to Github releases from Travis CI
• CI for an Arduino & Android repository