jrob/Expression-Evaluator — pull request #4 by bestb (2013-06-28 17:15:29+00:00)
Title: Adding ToString and IsNumber functions; fixing If-else evaluation bug

Added ToString and IsNumber functions. Also added try/catch to
expression evaluation to allow exceptions to occur in if/else logic. If
the exception occurs in the 'false' branch of logic, the expression can
still evaluate.