Feedback feature and workflow changes

db/2016-04-19-add-feedbacks.sql

db/create_db.sql

less/lib/colors.less

less/lib/fonts.less

less/main.less

public/css/main.css

src/Controllers/LockupsController.php

src/EasySVG.php

src/Models/Lockup.php

src/SvgGenerator.php

src/Views/manage_lockups.php

src/Views/preview_lockup.php