Add a few questions and comments
Free `dupe_str`
Rename `dupe_str` to `dupe_environment`
Shorten the trim
Dupe the `row_attr_data`, so we can properly `free` it in every case
Construct the `environment_data_stack` outside of the parse

This is a safer operation, in the event of an early return from
`env_replacements`
Remove unused dependencies
Merge pull request #18 from gjtorikian/review-2

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