Blender exporter corrected - texture wrapping

Hi, this is my first pull request (I'm very new to GitHub) so I hope the procedure is the good one.
Is there anything I need to do before sending you a pull request ? (like to create a new branch or something, I'm pretty new with these concepts...).
My purpose is to send you the commit corresponding to the file I corrected (Exporters/Blender/io_export_babylon.py), but in the pull request there is also a previous commit I made on March 22 to sync my repository with yours and I don't know how to get rid of it, sorry.
If you'd like to explain me what to do to be as clean as possible I'd listening with care (you can explain me in french if you're also french as I gess)