4 minor fixes

[bricas]

1. Warnings were thrown in a test due to a stray comma in the dies_ok calls.
2. When munging the spec/options, a variable was declared but not used, also the logic was overly complex.
3. Although you can read a spec from a url, the response was not checked for success.
4. Minor pod fix.

[fcuny]

Thanks!

[fcuny]

Thanks!