TreeCapitator IMC support

This commit adds compatibility with TreeCapitator.  

The NBTTagCompound is using the 3rd party mod config format to define the trees (that's what all the <block:Log Block ID 1>,0 stuff is), but if you'd like it to use raw integer block ID values using your custom block objects instead, then let me know and I'll do a new PR and close this one (that way might be easier to understand and maintain).  If you're fine with the format but would like an explanation of what each bit is I'll be happy to chat on IRC or over email to answer any questions.