ios crash on Push.setBadge()

Nobody has claimed this yet.

Hello!
I used setBadge like:

```
Template.RightMenu.onCreated(function(){
var instance = this;
instance.autorun(function () {
Push.setBadge(12);
})
})
```

I got in Xcode console:

```
2016-04-20 12:29:02.073 project[393:64982] active
2016-04-20 12:29:03.942 project[393:64982] Push Plugin register called
2016-04-20 12:29:03.981 project[393:64982] Push Plugin register success:
2016-04-20 12:29:04.054 project[393:64982] Push Plugin register success:
2016-04-20 12:29:04.064 project[393:64982] -[NSNull intValue]: unrecognized selector sent to instance 0x3913e9e0
2016-04-20 12:29:04.065 project[393:64982] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull intValue]: unrecognized selector sent to instance 0x3913e9e0'
*** First throw call stack:
(0x2250db8b 0x21ccadff 0x225134d5 0x2251112b 0x2243b358 0x197cb 0x99d01 0x1b82d 0x294c4679 0x29473fcf 0x294757bb 0x294756b7 0x29475653 0x2932cc61 0x2945cf97 0x292f7e93 0x292f98b7 0x259b441b 0x259b4893 0x224cfa67 0x224cf5e9 0x224cd9bf 0x2241c289 0x2241c07d 0x23a38af9 0x26b472c5 0x1353b 0x220c8873)
libc++abi.dylib: terminating with uncaught exception of type NSException
```

What did I do wrong?

Start at the Push.setBadge(12) call shown in the issue and inspect the iOS implementation behind it. Reproduce the crash using the Xcode log, then trace the NSNull intValue exception; done means setBadge no longer terminates the iOS app and the badge behavior is verified.

Written by the indexing model from the issue text.