Require unique username #20

Author: drewroberts

database/migrations/2014_10_12_000001_modify_users_table.php

@@ -22,7 +22,7 @@ public function up()
             if (config("database.default") === "testing") {
                 $column->default('');
             }
-            $table->string('username')->after('last_name');
+            $table->string('username')->unique()->after('last_name');
             $table->text('bio')->nullable()->after('password'); // Will be written in Markdown. The user profile image will come from Gravatar account for the email address.
             $table->text('title')->nullable()->after('bio');
             $table->softDeletes()->after('title');