Pycnic

This release isn't anything special, but here are the key changes.
- The handler's `before` method is no longer called on 404's.
- If `debug = True` now properly returns indented, readable JSON for all JSON responses.

Contains a few optimizations and features added by felixbuenemann.

Notably:
1. `request.get_header('name', default=None)`
2. Better caching of request object fields, such as `data` and `cookies`.
3. Many more supported HTTP statuses.

Also includes the ability to parse QUERY_STRING in requests.

Example:
- `self.request.args` - Dictionary of parameters.
- `self.request.json_args` - A json object passed via QUERY_STRING inside `json=`.