Updated Readme

Now documents error codes, building, dependencies, and license
added newlines to readme
even more emphasis
Merge pull request #6 from nagn/master

Better ReadMe
Added faudio_get_generator_volume
Added faudio_get_generator_volume to readme
Merge branch 'master' of github.com:nagn/fausnd
Implemented faudio_kill_all_samples and faudio_kill_all_generators
Added faudio_kill_all_generators and faudio_kill_all_samples
Merge pull request #7 from nagn/master

added faudio_get_generator_volume
gmk testing rig