minor README edit
Removed sound files
added note about Doxygen docs
added note about file formats
Adding audio operation tools. Readme, AudioOperations.cpp/.h, and /tools/ directory.
Merge branch 'master' of https://github.com/philadelphiagamelab/Sonic
added missing semicolon
added contributing instructs
Merge branch 'master' of https://github.com/philadelphiagamelab/Sonic
Merge pull request #23 from acannon828/master

Accepting all changes.
added graph for simulator
fixed bugs related to filterLength

in cases where azimuth and elevation hadn't changed sinced the previous
iteration, a new filter wasn't fetched and therefore filterLength was
never initialized, leading to undefined behavior.

it's weird though that it would still work on the phone, just not in the
simulator. according to git history though, it was at some point working
in the simulator as well even with this undefined behavior...