add mnubo company

[jslecointre]

The company mnubo has been added to the project as well as the logo.

I tested the project locally and noticed few issues :

• main.min is not found
  I had to remove {% javascript main.min %} to make it work. (I left the original version in my this pull request)
• in order to view the newly added logo (mnubo-logo.jpg) I had to copy the file under _assets/images directory However the instructions mention to copy the logo only in _img directory which I did.
• There was one missing logo sharethebus-logo.jpg in _assets/images directory which prevented me to have the code running on my local instance.(I had to copy it from _img to _assets/images to have it working properly )