Fix unsubscribing from projects in a gross, hacky way

Summary:
Fixes T5261.

This fix isn't very good. Two better fixes would be:

  # Add some sort of `setRole(SUBSCRIPTIONS)` method to `ObjectQuery`, which gets passed down until it reaches `ProjectQuery`, and `ProjectQuery` knows that it needs to load more data. This feels OK, but is a very general approach and I don't think we have many/any other use cases right now. I //think// this is the right way in the long run, but I'd like to have more use cases in mind before implementing it.
  # Add some sort of `loadAllTheSubscriptionStuffYouNeed()` method to `PhabricatorSubscribableInterface`. This feels OK-ish too, but kind of yuck, and doesn't lend itself to proper batching, and is silly if we do the above instead, which I think we probably will.

For now, just fix the issue without committing to an infrastructure direction. I think (1) is the right way to go eventually, but I want a better second use case before writing it, since I might be crazy.

Test Plan: Unsubscribed from a project.

Reviewers: joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Maniphest Tasks: T5261

Differential Revision: https://secure.phabricator.com/D9377
Changed behavior of "code block" button to use triple tick syntax ("```") instead of whitespacing.

Summary:
This is important when dealing in situations where there's ambiguity between code and lists, like with Objective-C code:

  - (void) foobar {}

will get your a list instead of the desired code block

Test Plan: Tested locally

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9379
Fix command typo in managing_daemons.diviner

Summary:
Fix the 'managing daemons' doc's example for launching daemons in a
way suitable for multiple web servers.  Separate the '--no-discovery'
argument with '--', otherwise it doesn't appear to be understood.

Test Plan:
Attempt to launch daemon in various ways, make sure to include
ways that are expected to fail, otherwise it may not be doing what
we expect.

    phd launch PhabricatorRepositoryPullLocalDaemon --no-discovery
    .. errors in daemon log 'unrecognised argument' ..
    phd launch PhabricatorRepositoryPullLocalDaemon -- --not-an-arg
    .. errors in daemon log 'unrecognised argument' ..
    phd launch PhabricatorRepositoryPullLocalDaemon -- --no-discovery
    .. no errors in daemon log ..

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D9374
Merge branch 'master-upstream'
HTML emails + basic DIFF colorizing

Summary:
Added support for side-by-side HTML and plaintext email building.
Also generate slightly colorized diff content in emails.

This is enabled by a new config, metamta.html-emails

Test Plan: Tested locally, but needs some unit tests probably.

Reviewers: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9375
Merge branch 'html_emails'