Add transaction-oriented editing to projects

Summary:
  - Make some editing operations transaction-oriented, like Maniphest. (This
seems to be a good model, particularly for extensibility.) I'll move the rest of
the editing operations to transactions in future diffs.
  - Make transaction-oriented operations publish feed stories.

Test Plan:
  - Created a new project.
  - Edited an existing project.
  - Created a new project via quick create flow from Maniphest.
  - Verified feed stories publish correctly.

Reviewers: btrahan, jungejason

Reviewed By: btrahan

CC: aran, epriestley

Maniphest Tasks: T681

Differential Revision: https://secure.phabricator.com/D1477

resources/sql/patches/100.projectxaction.sql

@@ -0,0 +1,11 @@
+CREATE TABLE phabricator_project.project_transaction (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  projectID INT UNSIGNED NOT NULL,
+  authorPHID VARCHAR(64) BINARY NOT NULL,
+  transactionType VARCHAR(32) NOT NULL,
+  oldValue LONGBLOB NOT NULL,
+  newValue LONGBLOB NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL,
+  KEY (projectID)
+) ENGINE=InnoDB;