Hart

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Changed
- The CLI ArgumentParser now defines `conflict_handler=resolve` to let subclasses override
defaults without having to first remove the existing argument.

Added
- `hart.utils.remove_argument_from_parser` to help CLI subclasses remove arguments that
are not relevant for them.

Fixed
- Retry initial pings and increase timeouts to reduce error rate when creating minions.

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Fixed
- Enable passing defaults on the CLI to override role config.
- Fix crash if using provider default size.

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Fixed
- Fix parser crash introduced in 0.14.2.

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Fixed
- Allow all create-minion arguments when creating role.

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Fixed
- Merge cli parameters with parameters from role parameters in the config file.

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Added
- Support for the af-south-1 and eu-south-1 EC2 regions.
- You can now manage a high-level resource called a "role". A role is basically
a named group of parameters to create a minion, and is usually what you'd use
in the salt topfile to allocate states to a minion.

Changed
- Digital Ocean is no longer used as the default provider if none is specified.