Please read the PDF at https://dl.dropbox.com/u/48335821/Modders/Mister%20Fiber.pdf regarding permission to use your mod(s).
Any issues opening the document, drop me a note.

Thanks!
Graham Campbell,
Lead Developer At MineUK,
Part Of The MineEU Network.

This actually should have gone on the forum thread not Github. That being said, if you read the OP of the thread you will see this:

"You have full permission to distribute ExtrabiomesXL within your modpack. No permission is required."

Thanks.