Adds Support for {id:"", src:""} Format...

[probityrules]

This fixes a few issues with the {src: "path/to/file", id: "audioId"} format for both sound registration and sound removal:

1. registerSounds passes the id to registerSound for each entry if it's defined.
2. Registration accepts src property in a hash.
3. Registration correctly accepts file-types in hash (parameter/variable name mismatch).
4. Sound removal accepts {id: "audioId"} format to mirror sound registration, like SoundJS v1.
5. Put in a rejection analogous to _fetchByUrlArray for _fetchByUrlHash since it appeared to be missing.