Jsonresolver

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- Make the module compatible with jsonref v1.0.0

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- Deprecated Python versions lower than 3.6.0. Now supporting 3.6.0 and 3.7.0.

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- Drops support for Python 2.7
- Updates testing method
- Updates python dependencies

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Bug fixes
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- Fixes issue with exceptions raised during e.g. resolver plugin
loading being caught and not propagated.

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Incompatible changes
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- Changes resolving to be based on hostname without 'http://' prefix.

Bug fixes
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- Fixes issues with the hostname not being matched resulting in the
same route on two hosts not to work.

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Improved features
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- Delays the url_map building until first resolve request.