use rails url helpers for the assertions so they don't fail so easily
adds the title to news entry links
factory failed, work packages do not have comments.

WorkPackage.instance_methods.grep(/comments/) => []
convert three unit tests for news into specs
remove unnecessary cleanup before running the specs
account for the fact that projects are now public by default
use rspec-mocks for mocking
Merge pull request #763 from opf/feature/useful_news_links_reborn

add news subject to url (reborn)