Fixed help URLs.
* All the URLs now go to respective pages on http://www.go.cd/documentation/user/current
Moved NOTICE folder.
* Just a move. No code changes.
* Earlier these files were accessed under '/help/' link. From now onwards they will be accessible directly under the server URL (served through Jetty, not Rails).
Fixed the link to 'Third Party Software' Notice.
Fixed failing specs.
Merge pull request #678 from mdaliejaz/fixHelpPageLink

Fix help page links and Moved Notice out of help doc.