Codeception test adjustments for basic and advanced applications

- Moved everything test-related into `tests` directory. Codeception tests are in `codeception`.
- Removed database module since we're using fixtures and migrations.
- Moved console entry points and bootstrap into `tests/codeception/bin`.
- Adjusted travis build scripts.
- Adjusted documentation to be consistent and reflect changes made.

apps/basic/tests/codeception/functional/LoginCept.php

@@ -0,0 +1,26 @@
+<?php
+
+use codeception\_pages\LoginPage;
+
+$I = new TestGuy($scenario);
+$I->wantTo('ensure that login works');
+
+$loginPage = LoginPage::openBy($I);
+
+$I->see('Login', 'h1');
+
+$I->amGoingTo('try to login with empty credentials');
+$loginPage->login('', '');
+$I->expectTo('see validations errors');
+$I->see('Username cannot be blank.');
+$I->see('Password cannot be blank.');
+
+$I->amGoingTo('try to login with wrong credentials');
+$loginPage->login('admin', 'wrong');
+$I->expectTo('see validations errors');
+$I->see('Incorrect username or password.');
+
+$I->amGoingTo('try to login with correct credentials');
+$loginPage->login('admin', 'admin');
+$I->expectTo('see user info');
+$I->see('Logout (admin)');