Navigation Bar 

Navigation bar implementation wired in. Interacts properly with the progress bar now so that it can be enabled/disabled and takes the place of the progress bar when enabled.
It is. This flag is the "Is the 'next' button 'next' or is it 'exit form'" logic, so if, for instance, there were two required questions that were single selects with optional "other" elements, you'd want the user to be able to exit (and know that the optional elements aren't required) after answering the mandatory questions. It does result int he progress bar turning green when not being full, though, it's possible that it would be nice to represent "non-mandatory" questions with a unique color.