Update auto-generated docs to v0.17.0
Avoid sphinx warning by keeping empty dirs
Fix pygit2 version
Generate docs with fixed version
working version for doc generation with sphinx
Merge remote-tracking branch 'cholin/origin/gh-pages' into gh-pages
Generate docs for v0.17.3
Documentation moved to www.pgyti2.org

Do not use github's gh-pages services. I hate having the docs in a
different branch.