Merge pull request #1 from gregcaporaso/master

initial pages for the cookbook
Merge pull request #2 from gregcaporaso/master

ENH: added some links, fixed some formatting
Merge pull request #4 from gregcaporaso/master

progressive alignment
Merge pull request #5 from gregcaporaso/master

Added output
Merge pull request #6 from gregcaporaso/master

clarified my comment about what we need
added new recipe
Merge branch 'master' of github.com:biocore/scikit-bio-cookbook
computing-pairwise-identity.ipynb
updated to ignore ipynb checkpoint files