Add Lambda native env vars

[geeknam]

Description

Add AWS Lambda native environment variables

Related to: #501

[coveralls]

Coverage increased (+0.02%) to 80.78% when pulling 6136f05 on geeknam:feature/aws_envs into 60cd824 on Miserlou:master.

[Miserlou]

This looks good, but it doesn't seem connected the the CLI yet - should I expect that in addition this commit?

[geeknam]

@Miserlou Zappa settings already includes environment_variables in stage_config. I'm getting the config from here: https://github.com/geeknam/Zappa/blob/6136f0548f6b42653f2495e880c7522ca5bd638f/zappa/cli.py#L1436

Not sure if that's what you mean

[coveralls]

Coverage decreased (-0.06%) to 80.707% when pulling 7f073e0 on geeknam:feature/aws_envs into 60cd824 on Miserlou:master.

[Miserlou]

Ah, so the problem there is that it's a conflict with the existing environment variables, which should be explicitly separated.

Please move these environment variables to the vendor-prefixed aws_environment_variables and update the documentation accordingly.

[Miserlou]

Also, the really interesting thing about AWS env vars is the use of KMS. Does this PR address that?

[jonatasbaldin]

@Miserlou could we close this since its merged?

[jneves]

Already merged.