Add misssing 'assets' part in publicPath

Merge pull request saleor#993 from elwoodxblues/fix-public-path-for-demo

Fix public path for demo

Merge pull request saleor#907 from mirumee/fix/drop-url-loader

Drop url loader

Add locale paths, fix en locale, bump Django

Bump django-payments dependency

Merge pull request saleor#920 from patrys/better-dashboard

Redo the dashboard based on material design

Merge pull request saleor#946 from bogdal/feature/open-ports

Exposing ports locally

Add populatedb to docs