3.0.4: add automatic VAT/charge/dance class print and enhance button visibility
3.0.5: remove registration, and dancer (with card if no dancer remains)
Enhance hover group-addon visibility
Display version number on GUI
Automatically use package.json version in installer
Reimplement sort on lists
Performance improvment on list displayal
Use latest node-webkit 0.10.5 (fix subwindow opening and console erasure)
Fix dump save at closure
Fix multiple copies of the same dance class
First try for statistics
Implement proper dashboard with due, missing certificate, knownby and dance classes distributions
Fix xlsx import
Use and customize ChartJS and StackedBar for ChartJS
Revert to node-webkit 0.10.4 due to fs instabilities