USB Host detection

[fcorneli]

Via:
http://developer.android.com/reference/android/content/pm/PackageManager.html#hasSystemFeature%28java.lang.String%29
we can detected whether an Android device supports USB Host mode:
http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_USB_HOST

We could extend the cordova-plugin-chrome-apps-usb Cordova plugin with an API for this. For example:

chrome.usb.cordova.hasUsbHostFeature(function (result) {
    console.log("USB Host supported: " + result);
});

[agrieve]

sounds good to me!

[fcorneli]

@agrieve before or after a 1.1.1?

[fcorneli]

@agrieve I've tried to do a PR between my unregisterReceiverFix branch and my issue4 branch. But then the PR ends up at my repository instead of @ MobileChromeApps. See:
e-Contract#1