Add favicon.ico
Background color of product groups now in database

Background color is an attribute of the ProductGroup model.
Merge branch 'master' into design
README format changed

from mediawiki (not working well) to github flavored markdown
Old Readme removed
Font Awesome added and better css
Better layout, product groups to categories renamed
Product import is working with easyWinArt's xls

EasyWinArts Excel Tabel can now imported
Change order of columns

On products show view change description and short_description
short_description is now first for description.