update composer.json

- add Contributors to authors (give some love to OS community)
- switch to PSR-4 instead of using the deprecated PSR-0
refactor deep-directory structure usage
merge #79 update composer.json (sstok)

This PR was merged into the master branch.

Discussion
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|Q            |A  |
|---          |---|
|Bug Fix?     |no |
|New Feature? |no |
|BC Breaks?   |no |
|Deprecations?|no |
|Fixed Tickets|   |
|License      |MIT|

Commits
-------

506c849f170735efabf4d313966480d25bbe1ea9 update composer.json
241aa7f82b352adb5a8fe2d0290d308fd7d9336b refactor deep-directory structure usage