pushing the problem around in circles, committing before the next circle
 backing up
 minimized node trait, removed add/remove input functionality
 Removed IsNode trait, removed Node struct, removed MixerInput, added NodeData struct, added Node trait
Merge remote-tracking branch 'upstream/master'

Preparing for a pull request.
 updated test docs. changed most methods to take SoundStreamSettings by value instead of reference
Removed unnessary file
Merge pull request #15 from mitchmindtree/master

Fixed an issue where adding node children would require recursive type parameters