added template document
added several sections
added several more sections
renamed for clarity
filled in remaining sections
added to tutorial index
moved metadata description to a new doc since it's used for filtering fasta and distance matrices too
linked to tutorial index
fixed formatting error
Merge branch 'master' of github.com:gregcaporaso/qiime into issue-808
Merge branch 'master' into issue-808
text clean-ups based on input from @jrrideout
Merge pull request #952 from gregcaporaso/issue-808

Issue 808