Cloudwanderer

- Added Launch Configuration discovery
- Added classic ELB discovery

- Added managed policy relationship to IAM Groups

- Added managed policy relationships to IAM users
- Fixed identity of IAM managed policies incorrectly getting created as Policyname instead of ARN
- Added explanatory error message to GremlinConnnector if an error occurs while saving an attribute that may exceed the `maxContentLength`
- Fixed bug causing IAM Policy Versions not to load their policies.
- Filter back _in_ AWS owned Managed Policies by default
- Filter _out_ non-default Policy Versions by default

- Added ability to override URN parts via a regex pattern (used for AWS Managed IAM Policies)
- Added per-execution resource filtering
- Changed default filtering for IAM policies to include AWS managed policies

- Fixed bug causing secondary attributes to be fetched twice.
- Added relationship between roles and managed policies
- Removed secondary attribute of inline role policy attachments
- Fixed secondary attribute of managed role policy attachments
- Added tests for IAM roles

- Fixed nonfunctional `read_all` method on `GremlinStorageConnector`