Readable name for batch notification sender

Release 2.0.14

Made e-mail address optional in batch checker website interface.

This address is set with the new `BATCH_NOTIFICATION_EMAIL` config
setting and defaults to the value of `EMAIL`.

Fix counters reporting on about page

We forgot to include the description extractor in the totals. Also,
it said batch jobs were excluded from the totals, which is not the
case.

Log result id for finished batch job

Fix link in batch notification if submitted from webservice

Link to mapview examples Gist

Update Mailcheck

Use Mailcheck in the batch jobs form

This enables attachement of these handlers to elements that are
added to the DOM later as opposed to being in the original source
HTML.

Fix crash listing zero batch jobs in admin

Update OS requirement in install docs

Optional email for batch jobs from webservices

Fix default service locations

This should have been in #70