Parse Server Azure Push

This module provides push capabilities for parse server via azure notification hubs.

Add to your parse app like so:
``js
var azurePushAdapter = require('parse-server-azure-push');
var ParseServer = require('parse-server').ParseServer;
var express = require('express');

var server = new ParseServer({
//... other config values ...
push: azurePushAdapter({
ConnectionString: 'notification hub connection string',
HubName: 'notification hub name'
})
});
`

If you do not want to explicitly specify a connection string or hub name,
they can be specified via environment variables:
* ConnectionString: process.env.CUSTOMCONNSTR_MS_NotificationHubConnectionString
* HubName: process.env.MS_NotificationHubName

Sending WNS Pushes

This module has the capability to send pushes to Windows devices. The default behavior is to send toast notifications:

`js
Parse.Cloud.define('myPushFunction', (req, res) => {
// sends a toast notification with text 'my toast notification'
Parse.Push.send({
channels: [ 'someChannel' ],
data: {
alert: 'my toast notification'
}
}, { useMasterKey: true })
.then(res.success)
.catch(res.error);
});
`

If you would like to send more advanced WNS notifications, you can through the use of the 'wns' object:

`js
// sends a raw notification with custom wns header
Parse.Push.send({
channels: [ 'someChannel' ],
data: {
alert: 'apple or gcm alert' // ignored if 'wns.data' exists for windows installations
},
wns: {
type: 'raw', // adds the X-WNS-Type: 'wns/raw' header
data: 'my raw notification', // the wns payload
headers: { // custom headers to be sent to WNS
'X-WNS-Cache-Policy': 'cache'
}
}
}, { useMasterKey: true });
``