Update PrintPriceExtension.php

Small docblock changes
Some minor fixes solved.

* Also removed non-controlled services and handlers
* All productBundle Repository logic has been deleted
Issue #13 Added interface into OpenExchangeRatesService
Issue #13 Removed unused namespace
Small docblock fixes
Issue #24

* Tests are not done
* Issue not ready
Issue #26. Migrating to PSR-4
Added README.md files into all Components
Issue #26 Fixed some Components PSR4 namespaces
Fixed typos/CS
Issue 26 Fixed PSR-4