mobile-config.js and push.config.json

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Hi Morten,

what do you think about moving push.config.json into mobille-config.js within App.configurePlugin function?

This is example from [meteor docs](http://docs.meteor.com/#/full/mobileconfigjs)

``` javascript
// Pass preferences for a particular PhoneGap/Cordova plugin
App.configurePlugin('com.phonegap.plugins.facebookconnect', {
APP_ID: '1234567890',
API_KEY: 'supersecretapikey'
});
```

So I guess something like:

``` javascript
App.configurePlugin('com.phonegap.plugins.push', {
"apn": {...},
"gcm": {
"apiKey": "myApiKey",
"projectNumber": "myProjectNumber"
}
});
```

Review mobile-config.js, push.config.json, and the Meteor App.configurePlugin documentation referenced in the issue. Determine how the push settings are currently loaded, then confirm that placing them in App.configurePlugin preserves the APN and GCM configuration and existing push behavior.

Written by the indexing model from the issue text.