Aws-ssm-run-command

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**Features and Improvements**

- add ``aws_ssm_run_command.api.better_boto.send_command_async`` and ``aws_ssm_run_command.api.better_boto.send_command_sync`` API.

**Minor Improvements**

- improve example code

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**Minor Improvements**

- add ``raises`` argument to ``aws_ssm_run_command.api.better_boto.wait_until_command_succeeded`` function. Allow user to specify whether to raise an exception if the command fails. Default to ``True``.

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- First release
- Add the following public api:
- ``aws_ssm_run_command.api.better_boto.CommandInvocationFailedError``
- ``aws_ssm_run_command.api.better_boto.send_command``
- ``aws_ssm_run_command.api.better_boto.CommandInvocationStatusEnum``
- ``aws_ssm_run_command.api.better_boto.CommandInvocation``
- ``aws_ssm_run_command.api.better_boto.wait_until_command_succeeded``
- ``aws_ssm_run_command.api.patterns.run_command_on_one_ec2.run_python_script``
- ``aws_ssm_run_command.api.patterns.run_command_on_one_ec2.run_python_script_large_payload``