ForgeModderTools isn't needed anymore, as Forge now has a Gradle plugin. The Gradle plugin does much more than ForgeModderTools ever did: it allows you to run mods from your IDE, as well as letting you view the deobfuscated Minecraft source code in your IDE.
If you really need to use Maven, try this Gradle --> Maven bridge.
Although attempts were made to update ForgeModderTools to Minecraft 1.7, those weren't really successful: ForgeModderTools has problems with many inner classes in Minecraft. As ForgeGradle would be a much better alternative, even when ForgeModderTools didn't have these bugs, I'm not going to do any more work on ForgeModderTools.