Use destroyStaleMetadata in deployCI rather than uninstall (note: this is hard wired to test)
Make unmanaged destroy mode configurable, defaults to full for backwards compatibility
Merge pull request #97 from SalesforceFoundation/feature/92-deployCI-use-destroyStaleMetadata

Make destroy method for unmanaged deployments configurable
Merge branch 'master' of https://github.com/SalesforceFoundation/CumulusCI into feature/95-managed-only-code