fixed implicit wiki-page creation
- added "create_page_url" to DispatchController.
- changed Pages::CreateController#new to assign page[...] params correctly.
Make sure that user_participations of page creators always have a changed_at attribute set.

Pages for which the corresponding user_participation of the current user doesn't have
a changed_at attribute set, don't show up on that user's "Recent Pages" section on
the dashboard.
I'm not sure if that is intended, but it seems so. Now newly created pages show up
again.
Also I removed User#may_admin?(thing), as it wasn't called anywhere but in Page#build!,
where it didn't work correctly.
Merge pull request #98 from Crabgrass/bugfix/4378-exception-when-viewing-page-that-doesnt-exist

fixed implicit wiki-page creation
make sure Page.build! never creates duplicate UserParticipations for the current user
UserParticipation test: make page initially owned by group instead of user, as creating a page owned by a user now automatically makes that user a 'contributor'
Merge pull request #97 from Crabgrass/bugfix/4372-dash-does-not-list-newly-created-pages

Make sure that user_participations of page creators always have a changed_at attribute set.
make models extensible we want to modify from the Moderation mod
PULL UP: removing the video fixture - no more ExternalVideo for now
app: make posts path_findable

We are using path finder on posts from the moderation mod
PULL UP:empty conditions for a path should be nil not "()"

this way we prevent a sql error and get what we want.
search_filter: allow search conditions without values
path_finder: add_flow_constraint to build SearchFilters for deleted
post and page now both have deleted? and deleted_changed?
posts: added flow setter so we can delete posts just like pages
page sidebar: refactor the link lists with partials and collections
posts: make the whole text td shy_parent for edit button

this way it will be displayed when you hover over the region not just when hovering over the text hight which can be very small
routes: forbid name posts - want to use it in moderation routes

We need nested routes to moderated_flags for a post there.
Using page/2/post/4/moderated_flag/6 would be too deep nested
Using admin/post/3/... is not appropriate as this is for non admin usage
use present? instead of any? which only works on collections
bundle: updating to recent version of debugger to fix travis
test empty page list in me pages view