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I know it's for an older version but it's not to hard to update.
http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571568-tutorial-1-6-2-changing-vanilla-without-editing
Maybe this one:
http://www.minecraftforge.net/forum/index.php?topic=30358.0
last one:
http://www.minecraftforge.net/forum/index.php?topic=22495.0
I know it's for an older version but it's not to hard to update.
http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571568-tutorial-1-6-2-changing-vanilla-without-editing
Maybe this one:
http://www.minecraftforge.net/forum/index.php?topic=30358.0
last one:
http://www.minecraftforge.net/forum/index.php?topic=22495.0