removes empty congratulation string
adds rescue with appropriate prompt for SyntaxError
removes verbosity from name_error prompt
removes verbosity from SyntaxError prompt
adds randomly generated 'push' question to ds assignment questions
adds variable names and adds array rotation to eliminate immediate resampling of questions/values
adds boolean and float assignments
fixes bug that caused repetitive arrays of float values
adds variable names to represent arrays of floats
fixes bug that allows users to reassign entire array instead of using Array#push