using tinytag to get music metadata instead of loads of other libs
merging latest devel changes into tinytag to keep compability.

Merge branch 'devel' into tinytag

Conflicts:
	cherrymusicserver/metainfo.py
Merge branch 'devel' into tinytag
removed test samples of tinytag
removed audioread as it will be replaced by tinytag
updated tinytag to version 0.3.0 which supports mp3 length estimation