#656 - Make stage history API honor offset.

Caching of the stage history API results was done based on page number, rather than
the offset. This is fixed in this commit.
#656 - Make modifications API honor offset.

Was the same issue as #656, which affected stage history.
#000 - Just formatting a test file.
#469, #506 - Fix session timeout properly.

Change needed to be in web.xml, not webdefault.xml. Jetty's internal
web.xml overrides whatever is defined in webdefault.xml. Web app's
web.xml is used towards the end and can override Jetty's web.xml.
#659 - Deleted help docs from code.
* Just deleting the docs. Not touching code in this commit.
* helper/resources/NOTICE/cruise_notice_file.pdf is being used elsewhere. Making this deletion a separate commit to make it easier to get files back if some files get deleted and are being used in places other than help docs.
Merge pull request #657 from arvindsv/fix_stage_history_api_offset

#656 - Fix stage history api offset
#659 - Removed code for help doc and fixed rspec.
* Go version 14.3 onwards help doc would not be packaged in the installer.
* The 'help' links now take the user to 'http://www.go.cd/documentation/user/current'.
Merge pull request #658 from arvindsv/fix_session_timeout_again

#469, #506 - Fix session timeout properly.
Merge pull request #662 from mdaliejaz/removeHelpDocs

#659 - Removed help docs from getting packaged