Bugfix and tidy-up

Allow the configuration file to be optional for test mode
Tidy-up the hipchat notifier module
    - Require a valid hipchat authtoken
Ignore temporary vi/vim files in .gitignore
Add extra debugging output
    - write out cache file to enable easy removal to force upload
    - clearly notify that no changes are seen so uploading not occurring

Change-Id: Ia418704b76090e284e0b801609f2f05bfa06b9ae
Reviewed-on: https://review.openstack.org/20380
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Khai Do <do.khai@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
Merge branch 'master' of github.com:wsoula/jenkins-job-builder