multiple file upload

[PawelSuwinski]

Support of multiple files upload by dataProvider.

Example of usage:

 <CreateGuesser {...props}>
    <FileInput source={"docs"} multiple={true} >
        <FileField source={"src"} title={"title"} download />
     </FileInput>
    (...)
 </CreateGuesser>

Some screenshot:

[alanpoulain]

Nice improvement!

[alanpoulain]

Thank you @PawelSuwinski.