Treeherder prod push

[Ed Morley]

Notable user-facing changes since the last email:
* It's now possible to extend the single-revision view to display pushes
prior to that revision.
* There are now UI controls for setting the "fromchange" and "tochange"
parameters - see "Set as {top, bottom} of range" on the per-push menu.
* The filter field now expands when focused.
* Several improvements to the "Annotations" tab.
* The sporadic incorrect job navigation when using the "previous/next
unclassified" keys has been fixed.
* The scroll-to behaviour when using previous/next keyboard shortcuts has
been improved.
* A few UI fixes to improve performance slightly.
* Log viewer: Job details top left are now shown from the ingested job
data, rather than the log header. This means job details are now shown for
non-buildbot jobs.
* API: Auto-generated docs are now available at treeherder.mozilla.org/docs/
* API: Non-buildbot submitters of job data can now provide the log/error
summary directly, avoiding needing to create buildbot-style logs that are
then parsed by Treeherder's log parser.
* Perfherder: Up to a year's worth of series data is now kept.
* Perfherder: Many UX & correctness improvements.

For the full list of changes, see:
https://github.com/mozilla/treeherder/compare/797eb14...e1077ac
(The perf analysis scripts were merged into the repo with full history,
hence the older commits)

If you see any issues, please file bugs in Tree Management::Treeherder*

Best wishes,

Ed