Allow parsing from a Stream

[bernardo-martinez]

I have a case where I receive the xls|xlsx|csv file as a Base64 encoded String, so I need to create a file in order to be able to parse it using ExOffice.

I think it would be nice to directly read from a Stream the file to parse instead of requiring a file path, i think it can be either by implementing it within existing parse and dispatching functionality depending on the type of the arg, or implement a new parse_from_stream function. WDYT?

I can work on an implementation if you see it feasible and useful

[AlexKovalevych]

yeah, it would be nice to have, probably a separate parse_stream function