adds some eager loading to the groups_controller

* this is probably not comprehensive but just what I noticed
enable testing plugins from OpenProject core

- created rake task to run plugin specs
- added config variable where plugins can register for tests
- added after(:suite) block in spec_helper to check for wrong used before(:all)
no longer serializes changes as they are declared to be serialized

As of rails 2.3.17, assigning a serialized object to an AR attribute
declared as serialized is not permitted

Conflicts:
	db/migrate/20100804112053_merge_wiki_versions_with_journals.rb
Merge pull request #62 from opf/feature/plugin_test_from_core

enable testing plugins from OpenProject core
Merge branch 'fix/groups_controller_eager_loading' into feature/rails3

Conflicts:
	app/controllers/groups_controller.rb
in case the cukes dont find something, give it more retries and wait a little longer
bundle update capybara cucumber
Removed the after_initialize callback in old syntax
as specifying the class name as second parameter in
"serialize options, Hash" causes options to always
have the default value of hash (an empty hash)
- see API documentation of ActiveRecord::Base -
so there is no need to call after_initialize
to create an empty hash if none is present.
Gemfile: Use https URLs for GitHub repos

HTTPs provides server authentication in contrast to the plain
git protocol [1].

[1] http://git-scm.com/book/ch4-1.html#The-Git-Protocol
Merge pull request #64 from opf/feature/rails3_github_https_urls

Gemfile: Use https URLs for GitHub repos
refactor trackers to use restful routes
the serialization doesn't work as expected. #names should be an array but is instead a one-element array containing a comma separated list, no matter what i do. this commit fixes it by expanding the comma separated list, so it will work with either version in case somebody fixes it in the future.
make the issue list sums cukes pass
small theme test fixes
i'm getting random errors when not explicitly logging in
add additional sync points for group membership cuke
only test for hQuery ajax calls when jQuery is ready (in cucumber web steps)
Fix GroupsController show
fixes regression in using an attribute introduces in 318e93a

A fix for serializing an attribute declared as serializable intended for the rails 2.3 branch was applied without taking note of the altered attribute name introduced in the rails 3 branch. The purpose of the serialization fix is still valid though. So this commit fixes both, the serialization bug 318e93a intended to fix as well as the regression introduced by 318e93a
Fix respond_with_content_type deprecation warning