[WIP] Release v1.0

This is a work-in-progress pull request for the next major release v1.0 which is going to be released in December.

- [x] Change the data type of HTTP headers in ENV (#80)
- [x] Change the data structure of parameters in Clack.Request (#81)
- [x] Replace `clack.util.hunchentoot:mime-type` by [Trivial-Mimes](https://github.com/Shinmera/trivial-mimes)
- [x] Delete clack.util.localtime. Use [local-time](http://common-lisp.net/project/local-time/manual.html) directly.
- [x] Delete clack.util.route and clack.app.route because they are deprecated. Use [My Way](https://github.com/fukamachi/myway) instead.
- [x] Delete clack.util.stream because it's not used anymore.
- [x] Delete `clack.util:make-tmp-file-name` because it's not used anymore.
- [ ] Move `clack.util.hunchentoot:url-decode` to `clack.util`.
- [ ] Move clack.logger (and clack.middleware.logger) to contrib.
- [ ] Delete clack.util.doc.
- [ ] Enhance clack.builder syntax.