Basic edit/create workflow for Phriction

Summary:
This is another chunk of D636, I just simplified it a bit and added slugs.

When you go to a page like /w/pokemon/, it allows you to create or edit the
page.

Title vs slug stuff is a little funky but I think mostly-reasonable.

Test Plan: Created and edited /w/, /w/pokemon/, etc.
Reviewed By: hsb
Reviewers: hsb, codeblock, jungejason, aran, tuomaspelkonen
CC: aran, hsb
Differential Revision: 643

resources/sql/patches/061.phrictioncontent.sql

@@ -0,0 +1,22 @@
+/* Patch 060 neglected to make this an AUTO_INCREMENT PRIMARY KEY */
+ALTER TABLE phabricator_phriction.phriction_document
+  CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY;
+
+/* Needs to be initially nullable for insert when documents are created. */
+ALTER TABLE phabricator_phriction.phriction_document
+  CHANGE contentID contentID INT UNSIGNED;
+
+CREATE TABLE phabricator_phriction.phriction_content (
+  id INT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  documentID INT UNSIGNED NOT NULL,
+  version INT UNSIGNED NOT NULL,
+  UNIQUE KEY (documentID, version),
+  authorPHID VARCHAR(64) BINARY NOT NULL,
+  KEY (authorPHID),
+  title VARCHAR(512) NOT NULL,
+  slug VARCHAR(512) NOT NULL,
+  KEY (slug),
+  content LONGBLOB NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL
+) ENGINE=InnoDB;