modified the contribution description and cleaned out some sphinx warnings
Minor updates to the description.
Merge pull request #18 from steinwurf/update-contribution-process

modified the contribution description and cleaned out some sphinx warnin...
Added how to specify compiler and fixed some warnings in documentation

Signed-off-to-Steinwurf-by: Chres W. Sørensen <cwso08@student.aau.dk>
Merge pull request #19 from chres/compiler_docs

Added how to specify compiler documentation
Fixed printing to specified ostream instead of cout

Signed-off-to-Steinwurf-by: Chres Wiant Sørensen <cwso08@student.aau.dk>
Cleaning up
Merge branch 'master' into new-symbol-id
Cleaning up
Merge branch 'new-symbol-id' of https://github.com/steinwurf/kodo into new-symbol-id