some initial clean-up of the cookbook recipes, in prep for starting the recipe of the week series
Merge pull request #12 from gregcaporaso/cleanup

some initial clean-up of the cookbook recipes
added fork-me logo
Merge pull request #16 from gregcaporaso/cleanup

added fork-me logo
DOC: Ribbon no longer overlaps nbviewer menu
Merge pull request #18 from ebolyen/master

DOC: Ribbon no longer overlaps nbviewer menu
Update Index.ipynb
Merge pull request #19 from ebolyen/master

added pixel value to banner