Clean Up Old Comments and Commented-Out Code

If any of these removed chunks are important, I'll gladly revert them!
And know I remember you linked me the [documentation][1] [last time][2],

> The leading +{ and {; always serve to disambiguate the expression to mean either the HASH reference, or the BLOCK.

[1]: http://perldoc.perl.org/perlref.html#Making-References
[2]: https://github.com/genome/genome/pull/261#commitcomment-8901121