First version of block 7 lecture 1.
Tweaked first slides for open assessment.
regenerated PDF for block 7 lecture 1
Added answers to first set of questions.
Added link to block 7 lecture 1 slides.
Switched to middleman.
Added last modified date to all pages.
Generate questions page from JSON.
Switch to Rsync.
Move hr to layout.
Moved assessment to top.