#1008 Created service for blog posts import; created service method for saving blog posts; created test for blog post import service;
Blog upload midifications
#1008  Blog import modifications
#1008 Reverted changes of media manager uploader
#1008 Created upload form for importing blog posts
#1007 Fixed converting arabic dates to strings
#1008 Blogs import: added validation, created import results list
Merge branch 'dev' into dev-1.6.0-blogs-import

Conflicts:
	Modules/BetterCms.Module.Blog/Commands/SaveBlogPost/SaveBlogPostCommand.cs
	Modules/BetterCms.Module.Blog/Content/Resources/BlogGlobalization.Designer.cs
	Modules/BetterCms.Module.Blog/Content/Resources/BlogGlobalization.resx
#991 Merged changes to import branch
#1008 Fixed tests for importing blog posts
#812 Blogs hasSEO filter: filtered out deleted sitemaps
#990 Fixed rendering of default blog post template when user has no access to see it
#992 Added ability to search within mages for user which has only user management role
#1010 Changed timeout for checking files status for the first time immediately after upload
#1008 Blogs import: implemented pre-validation of importing blog posts