Exposed basic app entry URL via codeception.yml, refactored configs of advanced app to read from config and define entry script in a single place

[skip-ci] Update structure-widgets.md

changed bootstrap namespace to jui

Conflicts:
	.travis.yml

- 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.

exclude parts that have different default values

fixes test break in HHVM due to export of a closure

Translated rest-rate-limiting.md and rest-error-handling into Russian [skip ci]

Fixes #4697: MSSQL query builder does not work for newer MSSQL versions when LIMIT is used without ORDER BY

Dynamic model typo fix

[ci skip] Fixing typo in guide-structure-modules