Minor tweaks and added some subsections

- changed the title of the notes that appears in upperleft corner
- version number now corresponds to semester
- made minor improvements to existing sections
- added 3 new subsections (An IBL Approach, Structure of the Notes,
Some Minimal Guidance)
Minor tweak and added a question

- modified title that appears in upper righthand corner
- changed version number to match semester
- made minor tweaks to existing content
- added a question after Problem 1.5