[IMP] Removed versions from libraries

- Also removed config.js and added config.js.sample
[FIX] Some UI changes and Angular init
[FIX] Updated Barcodescan plugin
[IMP] Version, id and plugins in config.xml
[IMP] Event list shows date and no registrants
[REF] Registrar can configure event by QR scan

- The app can connect to different servers
- Used localStorage to store events and servers
[DEL] config.js not longer used
[IMP] Added License GPLv3
[REF] Remove jQuery and added Angular bootstrap
[IMP] Using native notifications instead of alert
[IMP] Redo navigation to show in bottom
[IMP] Check network connection
[REF] Generation of OAUth client
[IMP] Added icons for IOS and Android
[IMP] Auto renew token when 401 error
[IMP] Redirect to events by default
[REF] Move declaration of Angular module to app.js
[FIX] Better style and remove debug log
[IMP] Added back button
[IMP] Style improvements