Updated makefile to run tests after building and added :clean and :all tasks.

Added UnityHelper module in order to show how to extend Unity.

git-svn-id: http://unity.svn.sourceforge.net/svnroot/unity/trunk@2 e7d17a6e-8845-0410-bbbc-c8efb4fdad7e

src/unity.c

@@ -334,3 +334,7 @@ void UnityEnd(void)
     }
 }
 
+int UnityGetNumFailures(void)
+{
+    return Unity.TestFailures;
+}