added auto-generated documenation for all PICRUSt scripts.

this addresses issue #40.
updated author and copyright information

this partially addresses issue #41
Cleaned up errors in PICRUSt capitolization and added install page
updated PICRUSt capitolization and added install page

this addresses issue #25.
partial fix for issue #50
rewrite of quickstart; this addresses issue #50
Merge pull request #52 from gregcaporaso/issue-40

a bunch of documentation updates and reorganization