make files for calculator framework
add constuctor for model
add constructor
init class StringUtils
write PositionalChar object and outline problem 2
write printNesting framework
problem 2 write line printing, works for well formated strings
problem 2 use PrintWriter instead of System.out
problem 2 first try, some matching errors
problem 2 fix matching '}' to '}' instead of '}' to '{'
problem 2 fix print line not flushing buffer
problem 2 add comments for braces and logic
problem 2 move main to experiment class
problem 2 move main to experiment class
problem 2 add check if stack is empty before poping
add experiments
outline controller string eval method, change model from a class to just a stack object
controller and model are linked, so remove model from controller constructor
bring back the model class, specify it's for doubles. Controller now has no idea what type of values are being used, it passes strings and poped values to the model, then the model deals with type.
write constructor and display method for view