Started refactoring of LPN stuff.
Various changes.
Pulled josh's version of onlineVBEM.pl
Moved PRISM specific files to ./prism/ directory
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