Marnadi

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- Enhancement: completely reworked project structure
- Enhancement: Route now has explicit subroutes
- Enhancement: added special http.Method descriptor which can be used for decorating function handlers
- Enhancement: Lazy made its variable private
- Enhancement: Response sets new value of Content-Length even if it's already set

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- Enhancement: reworked starting of response generation

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- Fix: uncaught exceptions are now reraised

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- Enhancement: the Response class now implements collections.Iterator interface
- Enhancement: reworked functional part of the Response class
- Enhancement: added descriptor behavior to the Lazy class

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- Enhancement: Header's __hash__() uses main value (w/o params) to calculate hash
- Enhancement: Header implements collections.Mapping interface
- Enhancement: added query_string, remote_addr, remote_host properties to the Request
- Enhancement: Request's environ property became public
- Enhancement: HttpError implements collections.Iterable and collections.Sized interfaces

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- Enhancement 15: added ability to provide param callback mapping when instantiating the `Route`