Iss #71 - Clean up magic numbers in common lib

With this change set, most of our magic numbers should be removed from the common code. There is one that is still kind of magic, but it at least has a comment explaining.

core/src/main/java/org/eclipsefoundation/core/exception/ApplicationException.java

@@ -11,6 +11,8 @@
 **********************************************************************/
 package org.eclipsefoundation.core.exception;
 
+import javax.ws.rs.core.Response.Status;
+
 /**
  * A custom exception used as a wrapper to handle basic runtime exceptions.
  */
@@ -19,19 +21,18 @@ public class ApplicationException extends RuntimeException {
     private final Integer statusCode;
 
     /**
-     * Instantiate an ApplicationException with a message. 500 Status is assumed.
+     * Instantiate an ApplicationException with a message. HttpStatus.SC_INTERNAL_SERVER_ERROR Status is assumed.
      * 
      * @param message the message to display
      */
     public ApplicationException(String message) {
-        this(message, 500);
+        this(message, Status.INTERNAL_SERVER_ERROR.getStatusCode());
     }
 
     /**
-     * Instantiate an ApplicationException with a message and http response status
-     * code.
+     * Instantiate an ApplicationException with a message and http response status code.
      * 
-     * @param message    the message to display
+     * @param message the message to display
      * @param statusCode The status code to return to the client
      */
     public ApplicationException(String message, Integer statusCode) {
@@ -40,22 +41,21 @@ public class ApplicationException extends RuntimeException {
     }
 
     /**
-     * Instantiate an ApplicationException with a message and a cause. Status 500 is
+     * Instantiate an ApplicationException with a message and a cause. Status HttpStatus.SC_INTERNAL_SERVER_ERROR is
      * assumed.
      * 
      * @param message the message to display
-     * @param cause   The cause of the error
+     * @param cause The cause of the error
      */
     public ApplicationException(String message, Throwable cause) {
-        this(message, cause, 500);
+        this(message, cause, Status.INTERNAL_SERVER_ERROR.getStatusCode());
     }
 
     /**
-     * Instantiate an ApplicationException with a message, http response code, and a
-     * cause;
+     * Instantiate an ApplicationException with a message, http response code, and a cause;
      * 
-     * @param message    the message to display
-     * @param cause      The cause of the error
+     * @param message the message to display
+     * @param cause The cause of the error
      * @param statusCode The status code to return to the client
      */
     public ApplicationException(String message, Throwable cause, Integer statusCode) {