Relaunch Cordova app if not running

[Taracque]

If no notification callback, the MainActivity of the app is launched. With this the app gets the data notification even if swiped out from recent apps list, or phone is rebooted.

[drptbl]

If application is killed and notification is received, this code causes application to start in foreground.

This pull request solves this:
Taracque#2

[hirbod]

@soumak77 isn‘t this PR legit. Just read the code but looks important?

[remisture]

Is this for Android only? I desperately need this for both iOS and Android. Opening push messages for killed apps has to be important for others as well? Or am I the only one still facing this problem?

[hirbod]

iOS is working fine for me, I also did not have any issues on Android but I’ve seen a lot of people complaining so this PR has to be reviewed.

[hirbod]

Did you test this on android? I did not.

[soumak77]

@hirbod I have not. I will wait to release a new version until I get confirmation the plugin is working as desired when installed from github.

[remisture]

Sounds like this plugin needs a better test regime.

[hirbod]

At least it has a travis ci :D

[soumak77]

@remisture agreed, currently the test suite only builds a basic app to verify the build isn't broken, but doesn't actually test any functionality