Avoid lengthy spam check in comments controller spec.

Since all comments in this set of specs are supposed to be ham, set
the sp_global to false, causeing all spam checks to be skipped. Requires
removing the All Requests shared example, because before blocks are also
not propagated to the calling block anymore.
Fix content_type assertion.

It seems the charset doesn't get stripped anymore when retrieving the
content type form the response object.
Make disabled spec show up in test output.
Set format using request.format=
Fix remaining serialized fields in fixtures.

Same as for blogs; nested YAML no longer works for these fields.
Replace `assert_(no_)difference` with `should(_not) change`.

The RSpec specs seem to have no access to the `assert_difference` and
`assert_no_difference` assertions. All specs now use RSpec's `change`
matcher.
Fix page count check in admin helper.

The WillPaginate::ViewHelpers.total_pages_for_collection method does not
exist anymore. Replaced with collection.total_pages.
Give different versions of #show_actions helper different names.

The wrong version of this helper method was being called. I'm guessing the
way these helper modules are loaded has changed. To avoid any problems, two
of the three implementations of #show_actions were renamed.
Get rid of #assert_template_has helper.

It is easily replaced by `assigns(key).should_not be_nil`.
Replace more :contents with :content in have_selector calls.
@controller.controller_name is now replaced by controller.controller_name
Adding dynamic form plugins as namy forms thing were deprecated. I'll remove it and upgrade this part later when working on the admin
@controller.controller_name is now replaced by controller.controller_name
Remove unused call to relative_url_root.
For some reasons I had moved everything from the read action into the general settings and didn't remove neither the method nor the test. rspec2 raised an error onmissing template rspec1 didn't
Call #params on controller, since plain params no longer works.
Replace have_text matcher with contains.
Avoid extra html escaping in #auto_complete_results.
Re-require action_web_service for BackendController.

Without this, the singleton methods are not properly loaded into the
BackendController class. A better solution is needed.
Remove unused read action from Admin::SettingsController.