Support custom sound on Android device

[zbranzov]

Hi Eddy,
I was able to use custom sound when my app is in the background using this enhancement phonegap-build#301. I also had to remove this line https://github.com/hartwig-cordova/PushPlugin/blob/android-sound/src/android/com/plugin/gcm/GCMIntentService.java#L105 in order to make it run but maybe you can find a better solution.
In our projects (AppBuilder) I put the mp3 in App_Resources/raw/my.mp3. This is the right place using our projects.

[AntonDobrev]

You can test the functionality with a push created from Telerik Backend Services. For example, send a notification payload like the following (where the sound name should be without the extension):
{
"Android":{
"data":{
"title":"Push Title",
"message":"Push message for Android",
"sound":"mysoundname"
}
}
}

More details about sending here:
http://docs.telerik.com/platform/backend-services/development/rest-api/push-notifications/sending-notifications

Best,
Anton

[EddyVerbruggen]

Sounds good guys (pun intended). I will look at this shortly!

[EddyVerbruggen]

Hi guys, I've integrated the fix. Also, you shouldn't need to pass in the defaults with this change as suggested here.

Please close this issue in case 2.5.1 works ok.

[AntonDobrev]

I can confirm that the new functionality really sounds good:)
Great job, Eddy.