Ftw.dashboard.portlets.recentlymodified

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- Drop Plone 4.1 support [jone]

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- Update portlet template to make the portlet class more generic
[elioschmutz]

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- Fix typos.
[mbaechtold]

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- Fix portlet creation if no ``UserPortletAssignmentMapping`` exists.
Normally, plone initialize a ``UserPortletAssignmentMapping``
for the ``dashboard`` on first login. If we use ldap-users, this
event will not be triggered correctly.
If we add a recentlymodifed portlet with such a user through the
"Watch changes"-action, the portlet will not be created.
This fix creates a ``UserPortletAssignmentMapping`` on portlet creation
if it does not exist.
[elioschmutz]

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- Exclude contents from the members folder and the custom
``recently_modified_view`` (this is configurable in plone.app.registry
through
``ftw.dashboard.portlets.recentlymodified.exclude_members_folder``).
[mbaechtold]

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- Add functionality to exclude portal_types over the plone.app.registry.
[elioschmutz]