Add review_tags, summary, tags to translation json
Making page-buttons static on edit page again

To avoid conflicts with content before or after it.
re-arrange, update, and simplify vagrant doc
Reduce the number of queries for attachment files.

Currently we’re doing 2 queries for each file, while we can easily
fetch the current revision in one query. MySQL will likewise be able to
cache that.
Merge pull request #2557 from mozilla/file-query-count

Reduce the number of queries for attachment files.
Merge pull request #2556 from groovecoder/vagrant-docs-cleanup

re-arrange, update, and simplify vagrant doc
Merge pull request #2524 from Elchi3/translation-json

Add review_tags, summary, tags to translation json
Merge pull request #2553 from stephaniehobson/page-button-fix

Fix problem with save/preview/discard buttons on edit page
Updated requests to 2.3.0 to fix a sync issue with wheel archive.

This is needed as we've rebuilt the wheel archive for the persona-allauth branch already.
Use the latest kuma-lib.
Add switch for enabling or disabling Optimizely

This will allow us to disable the Optimizely include when we are not
actively running experiments.
Merge pull request #2561 from openjck/optimizely-waffle-switch

Add switch for enabling or disabling Optimizely