Hart

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Fixed
- The EC2 provider will set instance tags if given in key=val format.
- The Vultr provider doesn't wrap the tag in brackets anymore.
- Vultr now automatically adds private IPs to the node if -p is given.

Added
- Extensible CLI for to create and destroy minions, and listing regions and sizes.
- Ability to customize EC2 root volume size.

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Fixed
- Crash when destroying node by id.

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Fixed
- EC2 couldn't destroy a node.

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Fixed
- Make ap-east-1 and me-south-1 work for EC2.

Changed
- Fully replaced libcloud with boto3 for EC2.

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Fixed
- EC2 size listing now filters out options that wouldn't be launched by hart, and also ensures all options are shown.
- Crash when listing EC2 sizes in São Paulo.

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Added
- `provider.list_sizes()` to list available instance sizes in the given region.
- `provider.list_regions()` to list available regions. For EC2 this includes the available zones.

Fixed
- Private networking is now initialized correctly on Vultr.