Foundation

[radmen]

This PR introduces basic setup for project.

It includes:

• configured composer package
• phpunit
• phpcs
• few, randomly picked, wrappers with unit tests
• initial Travis integration

What I assumed:

• minimal PHP version: 7.0.0
• functions are written using PSR-2 standard
• strict types by default
• define variables types in function API (if possible)
• NULL will be treated as undefined (eg. html_entities())

I've left PHP.php file, however it should be IMO removed.

[nkkollaw]

Very nice.

Thanks.