add initial commit for context management
add migration command, update admin, fix bugs, add unique indexes
fix tests
improve category support for multiple roots
add tree layout
update composer.json
Revert "update composer.json"

This reverts commit 8e5e71064bb4f6067cf0478ba605d2ad51f587d4.
fix modal integration
improve modal integration
remove parent filter
update changelog
Merge branch 'add_context'
fix tests
Merge remote-tracking branch 'sonata-project/master'