Webtest

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- Create universal wheels.

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- Fix 160: Do not guess encoding if response's charset is set.

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- PR 154 Allow Bearer auth

- PR 147,148 Take care of REFERER when using form.submit(), .click() and
.clickbutton()

- PR 145 Allow to override content-type when using json methods

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- nothing new release. just try to make wheel available on pypi

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- fixed 131 prevent passing HTML parameters that conflict with Field kwargs

- fixed 135 Document that WSGIProxy2 is required for "using webtest with a real url"

- fixed 136 reset values of select multiple

- drop py32 support (still work but test dependencies fail)

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- Avoid deprecation warning with py3.4