'show' template for emails filled;
fixed mistake in 'show' action'
emails list doesn't displays body first symbols any more
added mail encoding before its displaying
retrieving email body html code is now organized as particular function;
saving attachemts is organized now as particular function, which returns list of URLs for attachments;
folders for attachments now are generated UUIDs;
two last changes are give way to save new email in one DB touch (it worked throgh create-update-update before)
also folders are now created only for emails, which has attachments