Fix exception msg
Assert that os.system commands succeed
Pep8 fixes
Do not convert IOError to RuntimeError
Add function for creating temp directory
Update Copyright entries, fix PEP8 errors
Add script for bumping version
devflow-bump-version updates the version file that exists at thetoplevel of the git repository and commits the change.
Do not edit changelog in snapshot mode
Do not use vim for editing changelog when the mode is snapshot.Automatically set UNRELEASED distribution to unstable.
Fix typo
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