Auth and logging docs nits (cortexlabs#1931)

(cherry picked from commit 0f1b6b1)

Update version to 0.29.0

Provide default bucket name if bucket is not set (cortexlabs#1855)

(cherry picked from commit 7e08141)

Update version to 0.27.0

Update version to 0.26.0

Add docs for server-side batching in Python predictor

(cherry picked from commit 36f7e95)

Update stable version to 0.24.1

Update version to 0.24.0

Update README.md

Update stable version to 0.22.1