Add a very rough, proof-of-concept Jupyter notebook document engine

Summary:
Depends on D19252. Ref T13105. This very roughly renders Jupyter notebooks.

It's probably better than showing the raw JSON, but not by much.

Test Plan:
  - Viewed various notebooks with various cell types, including markdown, code, stdout, stderr, images, HTML, and Javascript.
  - HTML and Javascript are not live-fired since they're wildly dangerous.

Maniphest Tasks: T13105

Differential Revision: https://secure.phabricator.com/D19253

resources/celerity/map.php

@@ -9,7 +9,7 @@ return array(
   'names' => array(
     'conpherence.pkg.css' => 'e68cf1fa',
     'conpherence.pkg.js' => '15191c65',
-    'core.pkg.css' => '2d73b2f3',
+    'core.pkg.css' => '7daac340',
     'core.pkg.js' => 'b9b4a943',
     'differential.pkg.css' => '113e692c',
     'differential.pkg.js' => 'f6d809c0',
@@ -168,7 +168,7 @@ return array(
     'rsrc/css/phui/phui-object-box.css' => '9cff003c',
     'rsrc/css/phui/phui-pager.css' => 'edcbc226',
     'rsrc/css/phui/phui-pinboard-view.css' => '2495140e',
-    'rsrc/css/phui/phui-property-list-view.css' => '47018d3c',
+    'rsrc/css/phui/phui-property-list-view.css' => '871f6815',
     'rsrc/css/phui/phui-remarkup-preview.css' => '54a34863',
     'rsrc/css/phui/phui-segment-bar-view.css' => 'b1d1b892',
     'rsrc/css/phui/phui-spacing.css' => '042804d6',
@@ -850,7 +850,7 @@ return array(
     'phui-oi-simple-ui-css' => 'a8beebea',
     'phui-pager-css' => 'edcbc226',
     'phui-pinboard-view-css' => '2495140e',
-    'phui-property-list-view-css' => '47018d3c',
+    'phui-property-list-view-css' => '871f6815',
     'phui-remarkup-preview-css' => '54a34863',
     'phui-segment-bar-view-css' => 'b1d1b892',
     'phui-spacing-css' => '042804d6',