Merge branch 'hotfix/intundefined'
using binaries in local node_modules, added clobber target to remove all build utilities
Minor bug fixes to parser generation

Grammar still referred to nonexistent rules
Updated Jison dependency to version that supports error recovery
better automatic delimiter matching behavior (addresses problem with Differential operator)
Addressing "double-parentheses" issue with square roots:

"sqrt(x)" no longer renders as "\sqrt{\left(x\right)}"
Merge branch 'hotfix/sqrtdblparens' into develop