Add legacy and default resolvers

src/main/java/org/springframework/shell2/MethodTargetResolver.java

@@ -0,0 +1,14 @@
+package org.springframework.shell2;
+
+import java.util.Map;
+
+import org.springframework.context.ApplicationContext;
+
+/**
+ * Created by ericbottard on 09/12/15.
+ */
+public interface MethodTargetResolver {
+
+	public Map<String, MethodTarget> resolve(ApplicationContext context);
+
+}