allow to enable/disable update_by_web_hooks option for repository
Added ability to fetch_repositories by web hook from gitlab
added plugin setting - Fetch repositories by web hook
Repository.fetch_changeset skip repositories which should be fetched by web hook
Added ability to fetch_repositories by web hook from github
allow to processing webhook even if login_required is set
fixed headers
use Resque if defined
small fix
Added ability to fetch_repositories by web hook from bitbucket