Create role does not allow for document policies to be passed to it
Adding put_role_policy, get_role_policy, and list_role_policies, update_assume_role_policy
Removing duplicate import
Merge pull request #272 from tsanders/vpc_vpn

Virtual Private Gateway functionality
Merge branch 'enhancedIamRoleSupport' of https://github.com/kevgliss/moto into kevgliss-enhancedIamRoleSupport
Updates for IAM changes.
Merge branch 'kevgliss-enhancedIamRoleSupport'
IAM py3 fix.
Cleanup metadata setting and add fix for multipart uploads. Closes #274.
Merge branch 'master' into stable