Small API modifications:
- add load_parameters method
- init argument are now optional
- only store fd in self.store != None
- swap 'time_stamp' to 't'
- use loc[] instead of xs()
Add verbose mode and progressbar
Python 3 support (not yet fully tested)
Merge pull request #4 from hadim/master

Mainly small API modifications and new verbose mode for LAPTracker
Allow do_pca() on whatever dataframe we want
Don't save df in self.store in get_track()
Fix py3 logging propagation bug
Add verbose mode for LapTracker
Merge branch 'master' of github.com:bnoi/lap_tracker

Conflicts:
	lap_tracker/lap_tracking.py
Lots of code refactory for the matrices
still a bug in gap closing but merge and split seem to work
so it's still a work in progress
Ok doesn't look so bad