Remove stale overrides.

Remove paramiko and python-keystoneclient from overrides.
Merge pull request #50 from vaibhavsagar/master

Remove stale overrides for paramiko and python-keystoneclient.
Stop using a deprecated function.
Fix logging message formatting and move configuring to __main__.

Closes #49
Output the overrides -- and any extra info it may contain -- when run in verbose mode.

Closes #48
Make it obvious how to get override details
Update change log
Clarify overrides details
Bump the version number
Post-release change log fix
Add botocore-related package overrides.
Merge pull request #51 from vaibhavsagar/master

Add aws-cli and its dependencies.
Add overrides for logbook and pyrss2gen

Reported on Twitter by Robert Wall
Various tweaks to README