Mash-client

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- Integrate all endpoints from MASH v4.0.0
- Add authentication to requests
- Split up cli into multiple modules
- Simplify the echo dictionary function

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- Update client for mash server api changes.
[\21](https://github.com/suse-enceladus/mash-client/pull/21)

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- Add subnet option to ec2 add account.
[\20](https://github.com/suse-enceladus/mash-client/pull/20)

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- Improve the help message for additional region handling.
[\16](https://github.com/suse-enceladus/mash-client/pull/16)
- Add is publishing account option for gce accounts.
[\17](https://github.com/suse-enceladus/mash-client/pull/17)

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- add testing account option for gce account add.
[\15](https://github.com/suse-enceladus/mash-client/pull/15)

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- Add readthedocs documentation.
[\11](https://github.com/SUSE-Enceladus/mash-client/pull/11)
- Move default mash client config file.
[\12](https://github.com/SUSE-Enceladus/mash-client/pull/12)
- Add ec2 account has a single target region.
[\13](https://github.com/SUSE-Enceladus/mash-client/pull/13)
- Re-word cli option help messages.
[\14](https://github.com/SUSE-Enceladus/mash-client/pull/14)