Add Checkstyle to enforce codestyle rules

Rules are based on Sun style with a few minor modifications

Change-Id: I9457a669ee629ad6d92c5c3824e562723c7ef9d2
diff --git a/src/test/java/com/intel/jndn/mock/MockKeyChainTest.java b/src/test/java/com/intel/jndn/mock/MockKeyChainTest.java
index a599ae9..86d3b13 100644
--- a/src/test/java/com/intel/jndn/mock/MockKeyChainTest.java
+++ b/src/test/java/com/intel/jndn/mock/MockKeyChainTest.java
@@ -16,10 +16,12 @@
 import net.named_data.jndn.Name;
 import net.named_data.jndn.security.KeyChain;
 import org.junit.Test;
-import static org.junit.Assert.*;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 /**
- * Test MockKeyChain
+ * Test MockKeyChain.
  *
  * @author Andrew Brown <andrew.brown@intel.com>
  */