[composer] Move out password hashing

Some time ago we've started to use PHPPass class (see http://www.openwall.com/phpass/) for generation/validation of secure password hashes. Now, when we have Composer integration we can safely replace it (locally copied PHPPass library code) with composer dependency: https://packagist.org/packages/rych/phpass (16841 downloads and 803 this month). So it's pretty popular.

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