improved error handling

src/main/java/org/codesecure/dependencycheck/utils/DownloadFailedException.java

@@ -0,0 +1,30 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.codesecure.dependencycheck.utils;
+
+import java.io.IOException;
+
+/**
+ * 
+ * @author Jeremy Long (jeremy.long@gmail.com)
+ */
+public class DownloadFailedException extends IOException {
+    
+    private static final long serialVersionUID = 1L;
+    
+    public DownloadFailedException() {
+        super();
+    }
+    
+    public DownloadFailedException(String msg) {
+        super(msg);
+    }
+    public DownloadFailedException(Throwable ex) {
+        super(ex);
+    }
+    public DownloadFailedException(String msg, Throwable ex) {
+        super(msg,ex);
+    }
+}