Add support for bean names

Users can in inject Spring beans by name in Guice using
@Named, or they can inject Guice beans in Spring as long
as they have @Named providers.

Fixes gh-7

src/test/java/org/springframework/guice/module/SpringModuleWiringTests.java

@@ -51,6 +51,17 @@ public class SpringModuleWiringTests extends AbstractCompleteWiringTests {
 		public Baz baz() {
 			return new Baz(service());
 		}
+
+		@Bean
+		public Thang thing() {
+			return new Thang();
+		}
+
+		@Bean
+		public Thing that() {
+			return new Thing();
+		}
+
 	}
 
 }