Merge branch 'Fix_pyyaml_version' of https://github.com/Ekkertan/aiohttp-swagger into Ekkertan-Fix_pyyaml_version

updated version

Fixed bug with data definitions when want to add nested objects

- Fixed bug with data definitions when want to add nested objects
- Refactored tests a little
- Added support for python 3.7 and 3.8 to tox
- Written documentation regarding data definitions
- Fixing build
- Configured tests for latest 2.x and 3.x version of aiohttp server

Fix an issue with wrong methods in generated UI. Issue #68

Add possibility to provide data definitions

Update subclass of web.View verification. Issue #68

Fix path to static files

Read Unicode from YAML file

PyYAML yaml.load(input) Deprecation

Removed support of Python 3.5 from Travis

remove python 3.4 in travis file

Updated version for promoting to Pypi

remove python 3.4 in travis file

Loader added for yaml.load
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation

Blind attempt at making aiohttp-swagger compatible with pyyaml>5.1, ie.
handle yaml.load deprecation.
See
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation


for more details.

Signed-off-by: Pierre Cheynier <p.cheynier@criteo.com>

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