Merge pull request #14 from johnchase/master

fixed bug in pairwise_percent_id function
fixed typo
Merge branch 'master' of github.com:gregcaporaso/An-Introduction-To-Applied-Bioinformatics
added new notebook
first pass at adding some clustering algorithms - no text yet
unlinked the clustering notebook as it's not ready for viewing yet
more notes in this section
periodic commit
renamed
added output and some text fixes
improved greedy_cluster_kmer
improved cluster_greedy_kmer function
updated some function names, added a figure
updated output
added qiime exercise, not sure if this will stay a part of this repo - currently contains information specific to our class ipynb server