ion-spinner does not work on iOS 8

[zmbc]

Short description of the problem:

Ion-spinner does not display correctly in iOS 8.

What behavior are you expecting?

I expect the spinner to look like it does on other versions.

Steps to reproduce:

1. Create an app that uses an ion-spinner
2. Run on an iOS 8 device

Other information:
The problem is that iOS 8 webviews do not support CSS animation or transformation without prefixing (-webkit). That means that these lines, along with the others using the same properties, don't do anything. There need to be prefixed versions. I have added these locally and confirmed that it fixes the issue.

This accounts for 9% of iOS users, so it seems worth it to fix.

Which Ionic Version? 2.x

Run ionic info from terminal/cmd prompt:

Ionic Framework Version: 2.0.0-beta.11
Ionic CLI Version: 2.0.0-beta.32
Ionic App Lib Version: 2.0.0-beta.18
ios-deploy version: 1.8.6
ios-sim version: 3.1.1
OS: Mac OS X El Capitan
Node Version: v6.3.0
Xcode version: Xcode 7.3.1 Build version 7D1014