Send broadcast intent with uri

This adds support for broadcasts that require a URI.

In my case, I use it to notify image apps about a new image, ex:
```
window.plugins.webintent.sendBroadcast({
"action" : "android.intent.action.MEDIA_SCANNER_SCAN_FILE",
"url"    : "file://" + fileEntry.fullPath
},function() { },function(e) {});
```

Thoughts? Issue #10 .