BridgeDiscovery.searchPortal() mismatched return type.

[rob0rt]

Hi!

First of all, thanks for making this library. It's far more useful and easy to follow then the offical Phillips version of the SDK.

I've been working on an android app to control Hue, when I kept getting the exception:

nl.q42.jue.PortalDiscoveryResult cannot be cast to nl.q42.jue.HueBridge 

I believe this error is caused in the PortalDiscoveryResult class at this line:
https://github.com/Q42/Jue/blob/master/jue/src/nl/q42/jue/PortalDiscoveryResult.java#L9

When I change it to:

public final static Type gsonType = new TypeToken<List<HueBridge>>(){}.getType(); 

It works as desired and I do not get the exception. Is having the gsonType return a list of PortalDiscoveryResults desired? When using the method as shown in your documentation, it causes the error, making me believe this is a bug. If it is, I would be more then happy to open a pull request with the changes.

Thank you!