Restore a more surgical workflow/target check

Summary:
D3707 removed some overbroad rules for when we trigger workflows, but there is still one case we should check for -- an <a /> without workflow inside a <form /> with workflow. This occurs in, e.g., the "help" button in Remarkup.

If the node with workflow isn't a link, don't trigger workflow. This should allow the <a><img /></a> case to keep working properly.

Test Plan: Clicked "?" in remarkup bar.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D3722
Don't set mustcapture for falsey values

Summary: See discussion in D3722. Good catch -- I'd definitely say this is a bug.

Test Plan: Rendered two <div />s, one with mustcapture set to `true` and one to `false`. The first got `data-mustcapture`; the second did not.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D3723
Move skins toward modularization

Summary:
Two high-level things happening here:

  - We no longer ever need to put meta-UI (content creation, editing, notices, etc.) on live blog views, since this is all in Phame now. I pulled this out.
  - On the other hand, I pushed more routing/control logic into Skins and made the root skin a Controller instead of a View. This simplifies some of the code above skins, and the theory behind this is that it gives us greater flexibility to, e.g., put a glue layer between Phame and Wordpress templates or whatever else, and allows skins to handle routing and thus add pages like "About" or "Bio".
  - I added a basic skin below the root skin which is more like the old root skin and has standard rendering hooks.
  - "Ten Eleven" is a play on the popular (default?) Wordpress themes called "Twenty Ten", "Twenty Eleven" and "Twenty Twelve".

Test Plan: Viewed live blog and live posts. They aren't pretty, but they don't have extraneous resources.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3714
Add cached summarization to PhamePost

Summary: Restore summarization. Use the remarkup cache, and try to do it somewhat-intelligently (pick the first paragraph that looks like it's text).

Test Plan:
{F21323}

{F21324}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3715
Allow simple template-based skin definitions

Summary:
Lower the barrier to entry for installing and creating skins, so we can kill Wordpress. You can now install skins by dropping them into a directory, and build either "advanced" (full phutil library) skins or "basic" (simple PHP templates) skins.

Next up is getting static resources working in an easy way for skins.

I put these in `externals/` for now so they don't get hit by lint.

Test Plan: Viewed the Pokeblog with the Oblivious skin.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3717
Allow blog resources to be served without Celerity

Summary:
Allow skins to serve arbitrary resources without needing to be mapped, so we can have a vibrant community of amateur skinners.

For "basic" skins, just put all the "css/" on the page always.

Includes an image to prove that works.

@vrana, pretty sure this has no impact outside of Phame but it does change Celerity so it might be to blame if there's any weirdness with static resources.

Test Plan:
{F21341}
{F21340}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3719
Respect `phriction.enabled` in config

Summary: Eventually we'll have a real "uninstall" sort of thing, but until we do we should keep respecting this flag.

Test Plan: Disabled the flag, saw Phriction vanish from the application list.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D3724
Support simple table Remarkup in Phabricator

Summary: {F21402}

Test Plan: Generated docs, used it in comment.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3726
Raise a better error for trying to create an empty document in Phriction

Summary:
When you delete the content of a document in Phriction, we treat it as an attempt to delete the document.

In the case you're creating the document, we hit an exception trying to delete a document which doesn't exist yet.

Detect this case and raise a better error.

Test Plan: Tried to create an empty document, got a good error. Created a nonempty document. Edited a document to empty to delete it.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1920

Differential Revision: https://secure.phabricator.com/D3728
more translation
merge upstream
Merge branch 'master' of github.com:ZhihuDev/phabricator
 rebuild style