editor: start figure upload
models.js: change Figure.file to Figure.URL
editor.js: make isAbstractSaved a computed value
Figure: fix bug with missing figures
editor.js: save figure along with abstract
editor.js: modal form and layout for figure
Abstract: remove orphans
Framework: update to version 2.2.2
Merge pull request #104 from stoewer/master

Add figure support to editor

LGTM