Working towards version 0.1

* enable continuous integration
  * run unittests
  * build a windows .exe
* benchmark script to compare various versions
* rework folder layout
  - `src` for the main source
    - `cpu`
    - `ppu`
    - `apu` (not part of version 0.1)
  - `platforms` for different platforms  
    - `windows`
    - `linux`
    - ...