Add documentation for the registration package.

src/com/uncc/gameday/registration/Attendee.java

@@ -3,6 +3,8 @@ package com.uncc.gameday.registration;
 // TODO: Auto-generated Javadoc
 /**
  * The Class Attendee.
+ * Basic POJO for communicating information about people registered to attend
+ * a game, and for sending that information to the server.
  */
 public class Attendee {
 	
@@ -110,7 +112,4 @@ public class Attendee {
 	public void setId(int id) {
 		this.id = id;
 	}
-	
-	
-
 }

src/com/uncc/gameday/registration/AttendeeCallback.java

@@ -8,6 +8,8 @@ import retrofit.client.Response;
 // TODO: Auto-generated Javadoc
 /**
  * The Class AttendeeCallback.
+ * Used to implement a POST callback for Retrofit. Same deal as the ParkingCallback,
+ * not sure it's needed, but makes our lives easy if we need to change it later.
  */
 public class AttendeeCallback implements Callback<Attendee> {
 

src/com/uncc/gameday/registration/RegistrationClient.java

@@ -11,6 +11,9 @@ import com.uncc.gameday.rest.GamedayService;
 // TODO: Auto-generated Javadoc
 /**
  * The Class RegistrationClient.
+ * Client used for wrapping around the service provided by Retrofit. This way,
+ * all the lower-level details are handled, and we can overload some behavior
+ * to enable working with different classes.
  */
 public class RegistrationClient {