Refactor/redirector

[ixti]

Closes #94

[tarcieri]

Nice! Aside from #96, I think this was the last blocker for 0.6

[penso]

@ixti @tarcieri There is an issue with the current redirector code, craigslist gives a Location header like "//charleston.craigslist.org/search/(...)" which won't work, it needs to keep the previous protocol if url looks like "^//".

wget -S "http://charleston.craigslist.org/search/sss?query=vanagon&catAbb=sss&srchType=A&format=rss" for a header sample.

[ixti]

Well, as HTTP/1.1 RFC was updated now it became valid indeed (previous RFC was actually telling that Location should be an absoluteURI). I'll fix this as part of #112

[ixti]

@penso I just realized that I'm unsure if you experience issue or not, because (just reviewed) current code should handle this situation perfectly fine. Added spec (in master) to cover this. Please open an issue if current redirector gives you an error (works perfectly fine for me on 0.6.1 and master).