[#14] add FUSE create callback
[#14] updated the list of supported callbacks
[#14] implement ftruncate FUSE operation
[#14] make sure fuse_create will clear the FilePaths dir cache
[#14] make sure ftruncate flushes the FilePaths dir cache
utilize constants for generating file/directory attrs
[#14] implement support for fgetattr for FilePath Fuse mounts
[#14] expose the size of an open file for use with fgetattr
lock the files hash when releasing a file