add email for registration, set migration

site/server/database/migrations/2014_10_12_000000_create_users_table.php

@@ -14,7 +14,7 @@ class CreateUsersTable extends Migration
     {
         Schema::create('users', function (Blueprint $table) {
             $table->increments('id');
-            $table->string('name');
+            $table->string('username')->unique();
             $table->string('email')->unique();
             $table->string('password', 60);
             $table->rememberToken();