Issue 250: Allow for GNU formatted errors

compiler/java/com/google/dart/compiler/DartCompiler.java

Index: compiler/java/com/google/dart/compiler/DartCompiler.java
diff --git a/compiler/java/com/google/dart/compiler/DartCompiler.java b/compiler/java/com/google/dart/compiler/DartCompiler.java
index b67c0633bc988f1f7cd36156ec4ef0e44f9399a9..a585bb2a194e4ebb11ac3234166fcb575664346c 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -1048,9 +1048,9 @@ public class DartCompiler {
     }
     try {
       File outputDirectory = config.getOutputDirectory();
-      boolean printMachineProblems = config.printMachineProblems();
       DefaultDartArtifactProvider provider = new DefaultDartArtifactProvider(outputDirectory);
-      DefaultDartCompilerListener listener = new DefaultDartCompilerListener(printMachineProblems);
+      DefaultDartCompilerListener listener = new DefaultDartCompilerListener(
+          config.printErrorFormat());
 
       // Compile the Dart application and its dependencies.
       LibrarySource lib = new UrlLibrarySource(sourceFile);