Revert "Update build index.html." to remove BAD firefox message

This reverts commit 51af1191b84acd91c1f59197b98305660413b9af.
fix typo in export
Zip the model before sending it to the SKetchfab API
This is done to be able to add materials in a near future.
We use the JSZip library to create the zip file.
Compress zip files before sending them to sketchfab API
Using JSZIp DEFLATE strategy, based on zlib.js
removes dead code
exports mtl file
Moved the upload code inside a sketchfab JavaScript file
This file is intended to be a standalone Sketchfab JS library to handle file uploads
merge
Update the usage doc of the sketchfab JS library
Display an uploader box when uploading

The box needs CSS love.
This is a first work:
- uploading progress can be added
- it is not error proof when options doesn't contain a title
Fix conflicts
Enable reset and export buttons in menu