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Merge branch 'development' of https://github.com/bamboocreative/listsIO into development

Conflicts:
	app/AppKernel.php
	src/ListsIO/Bundle/ListBundle/Entity/LIOList.php
Changed username to nullable.
Made username canonical nullable.
Merge branch 'HotFix_FB500' into aws_production

Conflicts:
	web/assets/js/app.js
Reinstated not null on username and username canonical
Merge branch 'HotFix_FB500' into aws_production
Attempt to fix issue with login route (explicitly added 'login_check' to anonymous routes)
Merge branch 'HotFix_Login' into aws_production
Fixed type in security config.
Merge branch 'HotFix_Login' into aws_production