Force mods, to require a name

This is a port of my pr to FML back in January MinecraftForge/FML#592

Author: jamierocks

src/main/java/net/minecraftforge/fml/common/Mod.java

@@ -74,7 +74,7 @@
     /**
      * A user friendly name for the mod
      */
-    String name() default "";
+    String name();
     /**
      * A version string for this mod
      */