[TASK] Adjust to renaming of package TYPO3.Neos.ContentTypes

The new package key is TYPO3.Neos.NodeTypes
Fixed typo in NodeTypes TypoScript
[BUGFIX] Fix validation for submitted comments

This adds a preliminary validation of newly submitted comments
and fixes the date / time of these comments.
[!!!][FEATURE] New flat post hierarchy and paginated posts index

This changes the blog from the per-year-month-day structure to a flat
structure. A rudimentary migrate command is part of this change set
which does most of the migration from the old to the new structure.

The PostController now supports pagination for posts using the
new TYPO3CR Paginate widget.
[FEATURE] Flag removed posts when in workspace mode
[FEATURE] A (still rough) implementation of endless scrolling
[TASK] Include RSS feed generator - not yet fully functional!
[BUGFIX] Set Content Type for RSS feed
[TASK] Improve teaser for post index view and improve RSS feed
[FEATURE] Support for alternative RSS Feed URI
[BUGFIX] Fix route for create-new-blog-post
[BUGFIX] Fix RSS item links
[BUGFIX] Fix item link (from xml to html)
[BUGFIX] Fix composer package type
[BUGFIX] Prevent PageNotFound exception by paginate widget

If the current page's node has no Posts set at all,
the paginate widget will throw a Page Not Found exception
as if there were no additional posts on some subsequent
page; but this happens also on the initial call.

This patch circumvents this behavior with checking
if there are any posts at all, prior to invoking
the paginate widget.

Fixes #2
[FEATURE] Expand readme with a quick start

This adds some lines how to get really started
with the blog plugin.

Closes #1
Merge pull request #3 from afoeder/master

Commits for issues 1 and 2
[BUGFIX] Adjust ACLs to new role syntax

This adjusts the role identifier used in the ACL to the
new fully qualified role identifier and uses a new
convention for policy resource names.

Fixes #4