Added the complete information of the extras bundle to the JSON object return.
With that I could remove the functions getExtra and getExtraLines.
There was also a problem with getExtraLines, since it only provided the last line, not all the lines.
The keys are still the same as before, since I removed the android.-prefix from all the keys, so there should be no big issue with compability. Except for the lines, but I think it is right how it now works (see above).
Only the package is now fetched by a static parameter. Maybe it makes sense, to even get all the data from StatusBarNotification Object to have even more data to provide.
https://github.com/coconauts/NotificationListener-cordova/pull/9
