Merge pull request #282 from dimagi/left-pane-resize

Resizable vellum anyone?
Merge pull request #281 from dimagi/fullscreen

Fullscreen vellum anyone?
add comment to double scrolling fix
Merge pull request #283 from dimagi/no-double-scrolling

get rid of double scrolling on mouse wheel
Merge remote-tracking branch 'origin/help-text' into staging