Remove "rem" comment syntax

I could find no evidence that INI files should support the "rem" comment
syntax.  This changeset removes this syntax.  This allows option names
to begin with rem.  For example, "remote_path=/tmp" would be parsed a
comment prior to this change.
Merge pull request #8 from bgmerrell/master

Remove "rem" comment syntax
ignore error result for environment variables so that empty env vars work
Merge pull request #11 from brendensoares/feature/empty-env-vars

Adds support for empty environment variables