Routr

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* ``routr.static.static`` routes now can be distinguished via ``static_view``
annotation instead of view attribute (still here for backward compatibility)

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* fix ``routr.static`` behaviour

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* get rid of ``Configuration``, now ``route`` is just a plain function -- this
allows better composability w/o requirement to share configuration object
between different parts of the app

* add ``routr.static`` for serving static files

* add ``routr.utils.positional_args`` for introspection of positional arguments
of different types of objects and ``routr.utils.inject_args`` for injecting
positional arguments based on introspection

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* bugfixes to DSL

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* [not backward compatible] new DSL -- got rid of guards keyword argument which
is too noisy

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* [bugfix] incorrect reversal of urls with more than one param