Moved to Pandoc

1) Changed to Pandoc tool
2) Source file is now m4
3) Makefile creates m4->Pandoc Markdown->Output
4) Renamed makefile
5) Fixed some dependencies in makefile
6) Now need to ignore more output files from Pandoc
7) Added game source code to project as Pi Foundation no longer ships it
8) Updated readme with build information and other changes
Merge branch 'master' of github.com:alecthegeek/version-control-basics