Change README extension to use github markdown markup.
Fix error in the Python bindings.

CMake has problems finding the python package on a 64bit machine.

The way to fix this ws found here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=677598
Add information about building with Python.

- Python build information is in the README.
- Added information about the builddependencies for sounddecompress.
Reformat some text.

Changed to RST to use an easy list for commands.
Simplify the finding python process.
Merge remote-tracking branch 'rvanlaar/master'

Conflicts:
	Python/CMakeLists.txt
	README.rst