settings keys in DB converted to camel case

callback-based settings model replaced by async-based settings model

setup/knex/migrations/20171230134232_convert_settings_to_camel_case.js

@@ -0,0 +1,24 @@
+"use strict";
+
+function fromDbKey(key) {
+    let prefix = '';
+    if (key.startsWith('_')) {
+        key = key.substring(1);
+        prefix = '_';
+
+    }
+    return prefix + key.replace(/[_-]([a-z])/g, (m, c) => c.toUpperCase());
+}
+
+exports.up = (knex, Promise) => (async() => {
+    const rows = await knex('settings');
+
+    for (const row of rows) {
+        await knex('settings').where('id', row.id).update('key', fromDbKey(row.key))
+    }
+
+})();
+
+
+exports.down = (knex, Promise) => (async() => {
+})();