Webdispatch

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- added decrator API

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- added extra_environ argument to constructer
- drop python2.6 tests
- drop dependency for python2.6
- added type converter for url vars

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- added extra_environ method to DispatchBase class
- added support for Python 3.4

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- include char of "-" to urlmatch words `9 <https://github.com/aodag/WebDispatch/issues/9>`_

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- no changes

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- fix response body to bytes