Merge pull request #16 from sa-/master

Number Tutorial
see MAJOR-CHANGES August 29
Merge branch 'master' of https://github.com/piantado/LOTlib

Conflicts:
	LOTlib/Grammar.py
whoops small fix to generate
fixed error in fb probs
performance optimizations -- removed some asserts
see MAJOR-CHANGSE -- fixes for parent refs and InverseInline
Merge branch 'master' of https://github.com/ebigelow/LOTlib
Updated number tutorial: added noise parameter, fixed a few things, made stuff look pretty