Implemented support for rooms

I implemented full api support for rooms. That means:
- Create/Modify/Delete rooms/lightgroups
- Get information about group list / individual group
- Group actions: Change lighting for the whole group (except setting scenes, because scenes are not implemented in ha-bridge right now)
For now the rooms/groups can only be configured through the api and apps, it's not visible/changeable through the web gui.

src/main/resources/public/views/system.html

@@ -75,6 +75,13 @@
 						ng-model="bridge.settings.upnpdevicedb"
 						placeholder="data/device.db"></td>
 				</tr>
+				<tr>
+					<td>Groups DB Path and File</td>
+					<td><input id="bridge-settings-upnpgroupdb"
+						class="form-control" type="text"
+						ng-model="bridge.settings.upnpgroupdb"
+						placeholder="data/group.db"></td>
+				</tr>
 				<tr>
 					<td>UPNP IP Address</td>
 					<td><input id="bridge-settings-upnpconfigaddress"