Allow for operations within a service to override the signature_version.  Fixes #206.  Supercedes #208
Fix reference to no_auth.
Remove debug logging message.
Merge pull request #215 from garnaat/allow-anonymous2

Allow for operations within a service to override the signature_version.
Merge branch 'develop' of https://github.com/boto/botocore into develop
Spot Product Types are not the same as Reserved Instance Product Types.

Created new SpotProductDescription for use in Spot Instance calls and results