Add plot of performance to training

Bugfix

Merge remote-tracking branch 'origin/master'

change test

Delete test.py

added timer feedback bar

Add option to use all notes / only local data

Implements using user performance data to only show notes the user performs poorly on

Implementation of note selection based on user performance

Update README.md

Added exporting raw data to MySQL

Beginn processing

Delete settings.pyc

Merge remote-tracking branch 'origin/master'

implemented uploading of raw data to mysql database