removed unused files
removed al_showAvailableBlocks route which is not used anymore
passed alpha_lemon_cms.configuration to template_slots_panel and defined variable common_domain
enabled translation for tests
updated some functional tests
refactored
added a boostrap file to generate the database to run tests from a symfoy2 application
updated the upgrade document
clicking the empty slots placeholder notices that it is not editable and encourages you to add a new block
an opened editor can be also closed clicking somewhere on the page
updated unit test
deprecated the function to remove a single page attribute