Compose webhooks route onto policies.
Compose config routes onto groups.
Compose launch routes onto groups.
Compose policies routes onto groups.
Add an OtterGroup application for specific groups.

Included a bit of normalization of naming of 'group_id'. There should no
longer be any 'scaling_group_id' variables.
Compose OtterPolicy onto OtterPolicies.
Compose OtterWebhook onto OtterWebhooks.
Remove `log_arguments` where it is not used.
Merge pull request #375 from rackerlabs/composable-routes

Composable Routes