Fix resouce name for Neptune DBSubnetGroup

Fixes a typo for the Neptune DBSubnetGroup resource

Fixes ASG metric-collection property

Thanks to @AgentO3 for this fix!

Fix Policy Conditions

Thanks to @AgentO3 for this update that fixes a limitation with policy conditions.

Add support for AWS Neptune

Good work from @shooit for this additional service!

Update Firehose Spec

Thanks to @shooit for this update!

Loosening requirements for SAM templates

Thanks to @shooit for this update

ASG Tags and Fix for Cooldown

Thanks to @AgentO3 for these changes.

Route53 Resource Records

Another great contribution from @AgentO3!

Policy Metadata

Thanks to @AgentO3 for this update!

Base64, Policies and small fixes

• Adds base64 intrinsic function - thanks @AgentO3
• Fixes in Serveless specs - thanks @shooit
• Update and Creation Policies - thanks @AgentO3
• Adds spec for availability-zone - thanks @AgentO3