Pytransform speedup and worksheet history execution and reading refactoring

Lots of changes.

100x speedup in RDF generation
Cleanup of unused code.
Can now apply chained transforms by removing hasTransformation commands from r2rml model and relying on filtering jsonarray of worksheet history. 
Fixes publishing r2rml and rdf failing because directories no longer exist due to .gitignore
Removed checkHistory from ShowAutoModel, ShowModel, and SplitColumn commandfactories.
Reverted to incremental id generation.