adaptive learning rate for online VB-EM
Merge branch 'LPN' of https://github.com/edechter/GrammarInduction into prism

Conflicts:
	src/GIJoe/SRS/Prismify.hs
factor out number sentence generation, fix failed sampling
finish train/test sample generation for new number sentence types
copy AAAI paper to NIPS for re-formatting
Added files to the prism subdirectory.
Removed build files not associated with LPNs. Preparing to split LPNs into a different project.
Minor changes.
Removed files from prolog subdirectory (moving things to prism subdirectory seems more apt).
Added untracked files in prism directory.
Merged with josh's branch.