Fix key generation

[artygus]

Query string keys must be escaped after the split bacause:

• Query string could look like 'weird%3Dkey=whatever'
• Rake util's unescape method forces utf-8 encoding on strings, which will cause the "invalid byte sequence in UTF-8" error for the most string methods called on badly encoded strings, e.g. Rack::Utils::unescape('%D0%BA=%D1').split('=')

[grosser]

can you add a test for that ?

I'd prefer map { |s| unescape(s) } to be more normal / less fancy

[grosser]

can it use something more standard like @request.params ?

[artygus]

@grosser I added tests and rebased the commit. I guess we can't use params because params are merged with POST, although we could use @request.GET, but in that case resulting hash may have other hashes inside, e.g. from query string like this /test?a[b]=c&a[d]=e, and before Ruby 1.9 hashes didn't preserve keys ordering, so something like recursive sorting must implemented

[grosser]

thx for fixing this nasty bug :)