Adds listFiles helper function to Filesystem
Adds listFiles helper function to FilesystemInterface
Removes pattern filtering from listFiles Filesystem function, and adds function to EventableFilesystem
Adds listFiles tests
Refactors listFiles function to use closure
Merge pull request #226 from zanui/list-files

Adds listFiles helper function to Filesystem
Fix abstract adapter copy method.
Merge pull request #231 from taylorotwell/master

Fix abstract adapter copy method.
Corrected last PR
Actually pass the stream
Fixed the tearDown of FileTests
Check if the stream is not already closed in AbstractAdapter::copy
Updated league/event dependency
Creates BackupAdapter
Renames BackupAdapter to ReplicateAdapter
Adds PHPUnit tests for ReplicateAdapter
Code style cleanup