refactor: get rid of old pyannote.algorithm.clustering.optimization module
refactor: move FACETRACKSParser to its own module pyannote.parser.facetracks
style: PEP8
gitignore Sublime Text project and workspace
fix: get rid of old LabelMatrix API in get_tfidf_matrix
style(util): PEP8
improve(Annotation): deprecate ambiguous iterators

* deprecate __iter__ in favor of itersegments
* deprecate iterlabels in favor of itertracks(label=True)
* deprecate tracks in favor of get_tracks
refactor(clustering): update code for new LabelMatrix API
chore(util): add missing GNU-GPL header
chore(matrix): deprecate iter_values in favor of itervalues
improve: deprecation decorator prints traceback with depth 3