DOC: Link the help button to the wiki

The help button now links to the Qiita wiki, a resource that's still
very much in progress and that currently includes a guide on what to do
if you have per-sample sequence files and you want to process your data
using Qiita.
initial db changes
fixing errors
Merge pull request #715 from ElDeveloper/help-imporovements

DOC: Link the help button to the wiki
Merge pull request #718 from antgonza/vamps-db-changes

Initial db changes for vamps
Fixing travis: miniconda fix credit to @ElDeveloper
Merge pull request #723 from josenavas/travis

Fixing travis: miniconda fix credit to @ElDeveloper
Fixing merge conflicts