Fix bug in get_current_iwidgets
Fix bug loading fiware.plugins when django-social-auth is not installed
Validate PopupMenuBase input parameter "child"
Allow to enable/disable SubMenuItems
Clean up WirecloudRemoteTestCase login method
Remove unused code from LayoutManager
Fix problems pointed by pyflakes in wirecloud.fiware.plugins
Remove unused method: get_variable_value_from_var