Added extra image style to show media images in a grid of 3 items per row.
Changed the image size in the grid to new "Media grid" style
Added the navigation based on the Album season to the media overview page.
Themed the Albums overview and album detail grid.
Themed the media item navigator.
Themed the page titles.
Added sidebar navigation on album overviews and album detail page. Themed overview pages + album & media detail page.
Merge pull request #9 from zero2one/feature/theme_media_overview

Feature/theme media overview