Bump release version for '0.1.7'
tools/pipbot: Silence mkrelease script output

Issue #193.
tools/pipbot: Fix target assignment

Issue #193.
tools/pipbot: Don't create annotated tag
Merge branch 'release/0.1.7'
tools/pipbot: Fix invalid var ref

Issue #193.
tools/pipbot: Print newline after summary

Issue #193.
tools/pipbot: Push changes before deleting

Issue #193.
tools/pipbot: Push to stable

Issue #193.