Added getters/setters for "Receiver" class.
Updated "HardcodedReceiverDAO" class.
Added method to "ReceiverDAO" class.
Added "MongoDatabaseMapDAO" class.
Added "MongoDatabaseReceiverDAO" class.
Updated "MenuBar" class with rearranged menus.
Added "RESTTestMapsGET" class.
Added "RESTTestReceiverPOST" class.
Added "RESTTestReceiverPUT" class.
Added "RESTTest" class.
Added "RESTTestReceiversForMapGET" class.
Added "MongoDatabaseReceiverWrapper" class.
Added "org.restlet.jar" library.
Added "javax.ws.rs-api-2.0.jar" library.
Added "gson-2.2.4.jar" library.
added necessary libraries