@JeffryBooher  I don't think we should worry about it too much, since the file APIs are going to change in the not _too_ distant future anyway...  But fwiw, I think adding a `size` field is perfectly consistent with our current APIs.

Our NativeFileSystem layer is patterned after the W3C "Directories and System" File APIs, which is where our `getMetadata()` API comes from.  But that spec actually _does_ define a `size` field in the metadata: http://www.w3.org/TR/file-system-api/#idl-def-Metadata.  Our lower-level `brackets.fs` API is patterned _roughly_ after the Node `fs` API, but again the stat result object there also defines a `size` field: http://nodejs.org/api/fs.html#fs_class_fs_stats.