Acore-server-metadata

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**Features and Improvements**

- add ``acore_server_metadata.api.Server.update_db_master_password`` to update the master password of RDS DB instance.

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**Bugfixes**

- Fix a bug that ``Server.get_ec2`` and ``Server.get_rds`` methods returns terminated ec2 and deleted rds instances. They should be considered as "not exists"

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**Features and Improvements**

- add ``acore_server_metadata.api.Server.run_ec2`` and ``acore_server_metadata.api.Server.run_rds`` method to launch a new EC2 instance or RDS db instance.
- add ``acore_server_metadata.api.Server.associate_eip_address`` to associate eip address to EC2 instance.
- add ``acore_server_metadata.api.Server.create_db_snapshot`` to create a manual db snapshot for RDS DB instance.
- add ``acore_server_metadata.api.Server.cleanup_db_snapshot`` to clean up old db snapshots for RDS DB instance.

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**Features and Improvements**

- First release
- Add the following public API:
- ``acore_server_metadata.api.exc``
- ``acore_server_metadata.api.settings``
- ``acore_server_metadata.api.Server``