Remove @Override annotation for Java5 compatibility

src/main/java/org/xerial/snappy/SnappyBundleActivator.java

@@ -27,14 +27,18 @@ package org.xerial.snappy;
 import org.osgi.framework.BundleActivator;
 import org.osgi.framework.BundleContext;
 
+/**
+ * OSGi bundle entry point
+ * 
+ * @author leo
+ * 
+ */
 public class SnappyBundleActivator implements BundleActivator
 {
-    @Override
     public void start(BundleContext context) throws Exception {
 
     }
 
-    @Override
     public void stop(BundleContext context) throws Exception {
 
     }