fix readme (spec-first#585)

Make compatible with latest gevent version (spec-first#583)

See https://github.com/gevent/gevent/blob/master/CHANGES.rst#13b2-2018-05-03
```
The long-deprecated and undocumented module gevent.wsgi was removed.
```

Merge branch 'dutradda-aiohttp_support'

run tests against PyPI dependencies for release

FIX a typo causing an ERROR log (spec-first#523)

* FIX a typo causing an ERROR log

A small bug was introduced in spec-first#500 when sanitizing the request query
parameters. Instead of fetching the arguments from `request.query`,
the parameters were sanitized from the `request.form`. This causes an
error log to be printed, as the parameters are not expected for the
query (for example in the case of a POST request).

Fixes spec-first#504

* adds a fixture for testing query param sanitazion

Adds a simple fixture to test form and query parameter sanitazion. This
is mostly related to spec-first#522, in which the `formData` parameters were
treated as query parameters.

* add a test to validate form data params

* introduce testfixtures library

Restoring Flask-Injector support by passing "undocumented" path param…

…eters to the handler (spec-first#526)

* Restored Flask-Injector support

* Added a unit test to verify injection works (spec-first#469)

* Changed unittest to support Python 2