Use Addressable for handling URIs?

[RST-J]

Several filed issues (#100, #109) and the latest discussion in #170 showed that there are problems with URIs. And there is at least one more, the following test currently fails:

    schema = {
      "$schema"=> "http://json-schema.org/draft-04/schema#",
      "id"=> "http://俺:鍵@例え.テスト/p?条件#ここ#",
      "type" => "object",
      "required" => ["a"],
      "properties" => {
        "a" => {
          "id" => "a",
          "type" => "integer"
        }
      }
    }
    data = { "a" => 5 }
    assert_valid schema, data

Using Addressable to have the mess about handling URIs covered - instead of doing it ourselves (which would likely fail) - got some consent.

I closed #170 and opened this issue to discuss the URI stuff in general and started to work on the Addressable integration.

[pd]

Fixed by #174. Thanks for keeping up with all fo this @RST-J =)