Reports ported to ReactJS and Knex

Note that the interface for the custom JS code inside a report template has changed. It now offers promise-based interface and exposes knex.

shared/reports.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const ReportState = {
+    SCHEDULED: 0,
+    PROCESSING: 1,
+    FINISHED: 2,
+    FAILED: 3,
+    MAX: 4
+};
+
+module.exports = {
+    ReportState
+};