IO: meta/binary data interfaces
IO: adapted IOService to new interfaces
IO: Finetuned handlers API
IO: Renamed update/rename elements
IO: Removed getMetadata from binary handler
IO: More API fixed
IO: Fix IOServiceTest [unfinished]
IO: Added exceptions
IO: Flysystem exception handling + naming
IO: DFS api update + exception handling
IO: interface naming + exception definition
IO: IOService exception handling
IO: phpdoc
IO: Added prefix support to LegacyDFSCluster
IO: Removed LegacyKernel IO handler
IO: LegacyDFSCluster + test
IO: Flysystem handler tests
IO: Flysystem metadata handler
IO: Removed former handlers
IO: Fixed IOService to pass tests