Remove user specific files from the .gitignore file
Replace leafo/scssphp-compass with a custom Compass package (contao-components)
Replace leafo/lessphp with oyejorge/less.php
Update the dependencies (mostly components)
Adjust the build.xml file
Use backend through routing.
Fix code style.
Use dynamic routing generation.
Define the correct TL_MODE in old backend entry points.
Restore the app/config/routing[_dev].yml for local modifications.
Fix the main entry point
Add editing comment in the app/config/routing.yml.
Include the routing.yml in the app/config/routing_dev.yml.