first pass at adding missing text
various clean-ups to text and formatting
updated order of tutorials
updating to reflect that subsampled should always be used
clean-ups to text. Fixes #851
updated some text
fixes based on @jrrideout's comments
Merge pull request #945 from gregcaporaso/issue-850

completed otu picking "tutorial"
removing old output
added new output

Fixes #885.
Merge pull request #951 from gregcaporaso/issue-885

Issue 885
updated to correctly handle zero otus in the core

Fixes #642.
Merge pull request #953 from gregcaporaso/issue-642

updated to correctly handle zero otus in the core