Merge pull request #1 from nsendetzky/master

Fixes template path and preview image generation, easy permission setup
Create needed directories to avoid errors
Merge pull request #2 from cookiekiller/ensure_directories_exist

Create needed directories to avoid errors
Merge pull request #3 from nsendetzky/master

Updates to latest Arcavias core and adds config for default order update URL
Merge https://github.com/Arcavias/arcavias-demo