Adding MetricData class.
Update unit tests to be aware of MetricData return value.
Merge pull request #28 from garnaat/add-metric-data

Adding MetricData class.
Merge pull request #29 from lbernail/develop

Support for EBS volumes and tags for resources where describe methods is not sufficient
Adding support for Route53 HealthChecks
Merge pull request #31 from garnaat/add-health-checks

Adding support for Route53 HealthChecks
Fixing some small PEP8 formatting issues.
Merge pull request #32 from garnaat/pep8-tweaks

Fixing some small PEP8 formatting issues.
Adding support for RDS tags which are handled completely differently than other tags and, thus, required changes to tags_spec.  Also added some tests.
Merge pull request #33 from garnaat/rds-tagging

Adding support for RDS tags