Merge pull request #16 from johnchase/master

minor Changes
fixed  error in percent id calculation (it was percent dissimilarity)
Merge branch 'master' of github.com:gregcaporaso/An-Introduction-To-Applied-Bioinformatics
added some text that I wrote for the qiime otu picking tutorial
added cluster types graffle
updated images
more image clean-up
graffle file change
added cluster legend figure
added furthest neighbor example
added one more sequence as it is necessary to make the point about the difference between the methods
added nearest neighbor diagrams
added centroid cluster diagrams
cleaned up output
updated output
did some restructuring to hide/exclude certain sections (don't want to change links now, as students are using them, hence not re-naming directories)
added link to github homepage
Make iab pip-installable and testable via Travi-CI

Fixes #10, #19.
(Hopefully) fix issue with installing scikit-bio on Travis

Travis is using a newer version of pip that doesn't process dependency links by default.
Merge pull request #21 from ElBrogrammer/issue-19

Make iab pip-installable and testable via Travi-CI