Enable checkstyle

Change-Id: Ib1944d6aad665656d8a99d6663f8dca31aaf916e
diff --git a/src/main/java/com/intel/jndn/mock/MeasurableFace.java b/src/main/java/com/intel/jndn/mock/MeasurableFace.java
index c862756..2374995 100644
--- a/src/main/java/com/intel/jndn/mock/MeasurableFace.java
+++ b/src/main/java/com/intel/jndn/mock/MeasurableFace.java
@@ -20,7 +20,7 @@
 import java.util.Collection;
 
 /**
- * Provide API for measuring packet use on a given face
+ * Provide API for measuring packet use on a given face.
  *
  * @author Andrew Brown, andrew.brown@intel.com
  */