Add a plugin for uploading files(not images)

[humam-abd]

Closes #739 & Closes #1287 Hey @Alex-D, This is a plugin for uploading files(not images). This is working fine on chrome as well as firefox browsers. Please take your time to review this.

[humam-abd]

Local Testing

[humam-abd]

Documentation

How to use it?

<-- Import Trumbowyg plugins... -->
<script src="trumbowyg/dist/plugins/uploadfile/trumbowyg.uploadfile.js"></script>

Then you can use the new button definition uploadfile

$('#my-editor').trumbowyg({
    btns: [
        ['uploadfile']
    ],
    plugins: {
        uploadfile: {
            // Some uploadfile plugin options(same as upload plugin except `imageWidthModalEdit`)
        }
    }
});

[humam-abd]

Hey,

Same as here: #987 (comment)

Can you add documentation and a demo?

Hey @Alex-D, Checkout the demo and documentation i just added. Thanks.

[Alex-D]

Thank you :)

I think I will merge that with the existing Upload plugin