Add single user security mode (#3)

- Tweaks to SQL column definitions
- Implement class autoloading
- Split user config into its own file

src/user-config.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * USER CONFIGURATION ITEMS
+ *
+ * Editing the values here customizes the behavior of Feed Reader Central
+ */
+
+
+/**
+ * Which security model should the application use? Options are:
+ * - Security::SINGLE_USER (no e-mail required, does not require a password)
+ * - Security::SINGLE_USER_WITH_PASSWORD (no e-mail required, does require a password)
+ * - Security::MULTI_USER (e-mail and password required for all users)
+ *
+ * (NOTE THAT ONLY SINGLE_USER IS CURRENTLY IMPLEMENTED)
+ */
+const SECURITY_MODEL = Security::SINGLE_USER;
+
+/** The name of the database file where users and feeds should be kept */
+const DATABASE_NAME = 'frc.db';
+
+// END USER CONFIGURATION ITEMS
+//   (editing below this line is not advised)