Add Twitter as an authentication provider

Summary: Ref T3687. Depends on D6864. Implements the `OAuth1` provider in Phabricator (which is mostly similar to the OAuth2 provider, but doesn't share quite enough code to actually extend a common base class, I think) and Twitter as a concrete subclass.

Test Plan:
Created a Twitter provider. Registered, logged in, linked, refreshed account link.

{F57054}

{F57056}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6865
Add JIRA as an authentication provider

Summary:
Ref T3687. Depends on D6867. This allows login/registration through JIRA.

The notable difference between this and other providers is that we need to do configuration in two stages, since we need to generate and save a public/private keypair before we can give the user configuration instructions, which takes several seconds and can't change once we've told them to do it.

To this effect, the edit form renders two separate stages, a "setup" stage and a "configure" stage. In the setup stage the user identifies the install and provides the URL. They hit save, we generate a keypair, and take them to the configure stage. In the configure stage, they're walked through setting up all the keys. This ends up feeling a touch rough, but overall pretty reasonable, and we haven't lost much generality.

Test Plan: {F57059}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6868
Replace all "attach first..." exceptions with `assertAttached()`

Summary:
Ref T3599
Go through everything, grep a bit, replace some bits.

Test Plan: Navigate around a bit

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T3599

Differential Revision: https://secure.phabricator.com/D6871
Color tweaks for action list, headers

Summary: Starting to roll out the standard colors and spacing to action list, headers, and property views. Also softened the grey borders a hex.

Test Plan: Review Maniphest and Differential on desktop and mobile. Felt the flow of standardization waft over me.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6869
Tighten up ObjectItemList icons

Summary: Pulls the icon flush right in the objectlistview.

Test Plan: Review my stale diffs, and UIExamples page.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6875
Standard colors on config-tables

Summary: Moving standard colors in some new places, going well so far.

Test Plan: reload page

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6876
Handle user aborts during auth workflows in Phabricator

Summary: Depends on D6872. Ref T3687. Give the user a nice dialog instead of a bare exception.

Test Plan: Cancelled out of Twitter and JIRA workflows. We should probably do this for the OAuth2 workflows too, but they're a bit of a pain to de-auth and I am lazy.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6873
Reduce the amount of OAuth1/OAuth2 code duplication for rendering login buttons

Summary: Ref T3687. These buttons don't work quite the same way, but are similar enough that the code seems worth consolidating.

Test Plan: Viewed and clicked both OAuth1 (Twitter, JIRA) and OAuth2 (Facebook) login buttons. Got logins.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6874
Add JIRA doorkeeper and remarkup support

Summary:
Ref T3687. Adds a Doorkeeper bridge for JIRA issues, plus remarkup support. In particular:

  - The Asana and JIRA remarkup rules shared most of their implementation, so I refactored what I could into a base class.
  - Actual bridge implementation is straightforward and similar to Asana, although probably not similar enough to really justify refactoring.

Test Plan:
  - When logged in as a JIRA-connected user, pasted a JIRA issue link and saw it enriched at rendering time.
  - Logged in and out with JIRA.
  - Tested an Asana link, too (seems I haven't broken anything).

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6878
Add "JIRA Issues" field to Differential

Summary:
Ref T3687. This adds a field which allows you to link Differential Revisions to JIRA issues.

This is just about as basic as it can get, but gets the job done. The field enables itself if you have a JIRA auth provide. You enter JIRA issues in a comma-delimited format and it generates appropriate edges.

Nothing is pushed to the issues yet.

The only real rough part here is that if you commandeer a revision which is linked to issues you can't see, editing it is difficult via the CLI. This seems pretty much like a non-issue, but at some point we can let the field throw some kind of "RecoverableInvalidFieldException" which just warns the user. The "no reviewers, continue anyway?" prompt could then use that too.

Test Plan:
  - Edited via web UI, tried valid/invalid edits, checked that edges showed up in the database, added/removed issues, clicked issue links.
  - Edited via CLI, tried valid/invalid edits.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3687

Differential Revision: https://secure.phabricator.com/D6879
Only associate branch with task if maniphest is enabled

Summary:
Previously, maniphest tasks would get upated by diffs on branches
with tasky names, even if maniphest was disabled.

Test Plan:
Tested createing a diff in sandbox with maniphest disabled, on a
git branch named using the format "t###".  Without this change,
if there happened to be a task in the maniphest DB which matched,
it was updated an email was sent to users.

Reviewers: epriestley

Reviewed By: epriestley

CC: wez, slawekbiel, whhone, Korvin, aran

Differential Revision: https://secure.phabricator.com/D6881