Merge pull request #3 from stuycs-softdev/canvas

Add pen, undo and redo
Small ) in app.py
Merge branch 'frontend' of github.com:stuycs-softdev/proj3-7-DWAI into site
Merge branch 'frontend' of github.com:stuycs-softdev/proj3-7-DWAI into site
Merge branch 'site' of github.com:stuycs-softdev/proj3-7-DWAI
Updated profile.html
Changed backend
Merge branch 'site' of https://github.com/stuycs-softdev/proj3-7-DWAI into site
Fixed small error
Fixed toolbar login status on canvas page
Merge branch 'site' of github.com:stuycs-softdev/proj3-7-DWAI into frontend