Add system property to disable stack trace trimming.

This can be set by tools that cannot handle the trmmed stack traces.

src/main/java/org/junit/runner/notification/Failure.java

@@ -17,6 +17,7 @@
  */
 public class Failure implements Serializable {
     private static final long serialVersionUID = 1L;
+    private static final boolean disableStackTraceTrimming = readDisableStackTraceTrimmingPreference();
 
     /*
      * We have to use the f prefix until the next major release to ensure
@@ -35,11 +36,19 @@ public class Failure implements Serializable {
     public Failure(Description description, Throwable thrownException) {
         this.fThrownException = thrownException;
         this.fDescription = description;
-        if (thrownException != null) {
+        if (!disableStackTraceTrimming && thrownException != null) {
             StackTraces.trimStackTrace(thrownException);
         }
     }
 
+    private static boolean readDisableStackTraceTrimmingPreference() {
+        try {
+            return Boolean.getBoolean("org.junit.junit4.disable-stacktrace-trimming");
+        } catch (SecurityException e) {
+            return true;
+        }
+    }
+
     /**
      * @return a user-understandable label for the test
      */