#1008 Blogs import: form for pre-validation of importing blog posts
#1008 Blogs import: implemented ability to select importing blog posts
#1017 Created sql fix for master pages with status == unpublished
#1008 Blog post import modifications: deleting file, UI fixes
#1008 Blogs import: Added validation if any files are selected
#1008 Implement import file deletion after import cancellation
#1008 Added current items, when creating blog post URL