Removes URI patching

After reviewing RFC3986 and Rack::Utils code, I realized that '+' are
reserved and therefore should be escaped by the CLIENTS, so Rack's
interpretation of + as spaces is fine.
Rename directory for model fixtures
Corrects fixture naming
Stubs latest advisories using a loop
Merge pull request #18 from mxabierto/remove-hack

Remove patch to recover lost + in URIs