Cleaning up solutions blocking further bug discovery

[szepeviktor]

How about

1. redesigning helpers loading using $this->add_helper outside a class (maybe a static method?)
2. moving from extract towards wp_parse_args
3. undefined $user in https://github.com/devgeniem/dustpress/blob/master/models/user-activate.php#L60
4. introduce TravisCI: syntax check, coding style, static analysis

@Nomafin What do you think?

[Nomafin]

Hi Viktor!

These suggestions sound good. I'll review your pull request and these questions more accurately in Monday or Tuesday and comment them further then.

[szepeviktor]

@Nomafin Static analysis for WordPress was just released: https://packagist.org/packages/szepeviktor/phpstan-wordpress