Added a note about git add --force
Added a note about git add --force

Thought students should know that .jar files are ignored and how to get around the .gitignore.
UCSB-CS56-F17/ucsb-cs56-f17.github.io,UCSB-CS56-F17/ucsb-cs56-f17.github.io,UCSB-CS56-F17/ucsb-cs56-f17.github.io,UCSB-CS56-F17/ucsb-cs56-f17.github.io,UCSB-CS56-F17/ucsb-cs56-f17.github.io