Fixing some issues with runtime annotations within avian.

We were not properly converting dots to slashes internally for package names
and we did not properly handle Method.getAnnotations and
Method.getAnnotation(Class<T>) on methods without any annotations.

Added some tests to cover these cases.

classpath/java/lang/reflect/Proxy.java

@@ -358,7 +358,7 @@ public class Proxy {
     int[] interfaceIndexes = new int[interfaces.length];
     for (int i = 0; i < interfaces.length; ++i) {
       interfaceIndexes[i] = ConstantPool.addClass
-        (pool, interfaces[i].getName());
+        (pool, interfaces[i].getName().replace('.', '/'));
     }
 
     Map<String,avian.VMMethod> virtualMap = new HashMap();