consistently handle environment variables #212
Merged
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This change makes sure that any environment variables passed in are appended to the current OS env vars. Adds tests to document behavior across languages.
Fixes #196
Note: there is a breaking change for go types for Args and Env, but this is in the category of "never worked in the first place". The unmarshalling fails when you specify environment variables as is, so this change to types just makes it work as intended.