Fix bug 786320: Redirect DevNews page and feeds

Believe it or not, we still get a significant number of requests for
these resources -- around 13,000 per year.
fix bug 934472 - Use IDs to signify anchor points
Remove template not used anywhere
Make i18n for 'callout-firefoxos' link in homepage.html
Update elasticutils to latest version.
Merge pull request #2261 from jezdez/elasticutils-update

Update elasticutils to latest version.
Merge pull request #2317 from darkwing/remove-template

Remove template not used anywhere
Merge pull request #2314 from darkwing/main-content-again

fix bug 934472 - Use IDs to signify anchor points
Try to fix the Travis notifications.
Fix a overlooked API.
Merge pull request #2318 from saneyuki/top_i18n

Make i18n for 'callout-firefoxos' link in homepage.html
fix bug 999102: Respond with 404 for $history where document has no revisions
Merge pull request #2284 from openjck/emulate-devnews

Fix bug 786320: Redirect DevNews page and feeds
Merge pull request #2315 from lmorchard/999102-history-error

fix bug 999102: Respond with 404 for $history where document has no revisions