Tests: Fixed regexp which was incorrectly reformatted and broke test totally.
Tests: Do not mock editor, because it will not be fully initialized and thus some methods may malfunction.
Tests: tagged autop tests.
Added auto paragraphing for nested editable.
Fixed auto paragraphing in nested editable on enter key.
Fixed code style and added comment pointing to ticket.
Changed shouldAutoParagraph condition to check just contenteditable attribute.
Refactoring: Looking for closest editable uses getAscendant methodnow.
Tests: Added auto paragraphing tests for nested editable.