[Added initial mentions-jobs
service](3656190114)
This is the result of running `cp -r jobs mentions-jobs` in the services
directory.
[Waited for mentions-jobs queue before
shutdown](2bb1a12a89)
This matches the functionality of the existing jobs service where we
will wait
for jobs to complete before closing the process.
[Used mentions-jobs service in the mentions
service](4e4f9fdd00)
This ensures that any delays in the mentions jobs queue does not effect
other
parts of the application.
refs TryGhost/Team#2508
-added sending service e2e tests
-should job off this sending service for better tests
-and for ghost to finish processing the job before shutdown