Remove dinosaur question.
Modify class goals.
Clean up class4.
Simplify the increment/decrement notes.
Start adding HTML & CSS review.
Add notes about css rules.
Add HTML element slides.
Add link to next slides.
Clean up some unneeded content in class1.
Comment out modulus to save time.
Add notes about exercises building on each other.
Add link to next set of slides.
Remove unneeded content from class2.
Add link to next slides.
Add link to last set of slides.
Merge branch 'master' into gh-pages