Update LICENSE

Year range updated
Merge pull request #85 from peterkokot/patch-1

Update LICENSE
Sync codebase with sonata-doctrine-orm-admin-bundle

Comment and formatting only
Sync codebase with sonata-doctrine-orm-admin-bundle

Remaining, mostly mapping related
Merge pull request #84 from KingCrunch/sync-codebase-3

Sync codebase with sonata-doctrine-orm-admin-bundle
Merge pull request #83 from KingCrunch/sync-codebase-2

Sync codebase with sonata-doctrine-orm-admin-bundle