Added "local" to SanitizationWhitelis for BlackBerry 10 apps

# Description
BlackBerry 10 browser use `local` as shortcut to application resources.

# Steps to reproduce
Packed a HTML5 app with Cordova for BlackBerry 10. And you will see that all application resources use `local:///``
. 

## Apache Cordova resolved the issue
[[BlackBerry10] resolveLocalFileURI should work with local:/// paths](https://issues.apache.org/jira/browse/CB-5810) on January 2014.
On the BB10 platform, local:/// is a shortcut to application resources
The file plugin should respect these URIs

# Related issues
["local" protocol should be included in imgSrcSanitizationWhitelist](https://github.com/driftyco/ionic/issues/1066) on [IonicFramework](http://ionicframework.com)