adding tense feats

src/main/java/edu/illinois/cs/cogcomp/features/AllFeatures.java

@@ -20,6 +20,7 @@ public class AllFeatures extends Classifier {
     {
         features = new ArrayList<>();
         features.add(new ClauseFeature());
+        features.add(new TenseFeature());
         // features.add(new VoiceFeature());
         features.add(new FrameFeature());
         // features.add(new FrameVoiceConjFeature()); // 93.495 48.640 F1 63.990