Revert "Removed .DS_Store from versioning"

This reverts commit 009296f1afdaccc12d4e74fe45b3c5c2df9d1420.
Revert "Added composer lockfile to versioning, see https://blog.engineyard.com/2014/composer-its-all-about-the-lock-file for further reading"

This reverts commit cc5dd3d77857f167b28009d6272543bb91e7660c.