gitignore bak files
code cleanup: semicolons and other pedantic edits: whitespace
SHA-1: 34233d9a278fba3bf65e427336a33ac50d188e5d

* Added fix for when grammar file leaves some (invisible) whitespace on the empty lines between lexer rules: previously, the lexer would, depending on the exact input, barf an inexplicable hairball or (worse!) fail silently. Unit tests to verify the success of the fix have been included.