Updated RF Consumer/Producer to work with the new RF API

Subject is self-explaining :)



This will fix:
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1293983-powerconverters-originally-by-powercrystals?comment=92


I Suggest increasing the PowerConverters version again, 
as this may cause incompatiblities with mods which're not ported to the new api yet.

The producer will be still able to produce energy for 'legacy' api-implementations but consumer wont be able to receive from legacy.