Streamline build process

[ElmerLastdrager]

In order to organise this repository better and allow other to compile/deploy their own SPIN software, we need to streamline the build process. This includes CI functionality. Braindump below.

• [ ] Incorporate build-scripts to main repository
• [ ] Deploy CI (Jenkins or Travis or anything that makes the most sense)
• [ ] Use several branches: master (development), beta (for testing), release (latest stable). Maybe use versioned release branches?
• [ ] Tag all releases and make sure they get build and uploaded automatically.