Avoid "already initialized constant" warnings when reloading files

[doxavore]

Once I was able to get non-spec classes reloading on changes with the Guard 1.1 fix in #17, I am receiving a ton of "already initialized constant" errors.

I'd rather a solution that doesn't disable warnings completely, but I can't seem to find a way to ignore a specific type of warning from logging out.

[jkutner]

let me think on this one for a bit.