Ataki/gridfs

@stvstnfrd to review commit
It looks like the naming convention is inconsistent for this variable.
The formatting switch between Python and JavaScript is expected
(`maxFileSize` vs. `max_file_size`), but lets stick to using the same
combination of words everywhere (`maxFileSizeInMb`, not `maxFileSize`,
etc). I prefer maintaining the units suffix everywhere to remove
ambiguity.