Adds styles-small-screen.css for the small resolution.
modify font and image size of the presentation page.
Merge branch 'develop' of https://github.com/developathe/mintberrycrunch-theme-zen into develop
Adds presentation CSS page for small resolution.

Update styles-small-screen.css to permit to see all informations on
presentation page for small screen.
Merge branch 'develop' of https://github.com/developathe/mintberrycrunch-theme-zen into develop