Add connect/read timeout option

[lbalmaceda]

Changes

The connect and read timeout can be customized in the requests dependency whenever an HTTP method is called. This is a per request setting, not global.

The accepted values are either a float to setting both timeout values to the same value, or a tuple to decide values separately.

Open to suggestions

• The default timeout value for both attributes on this PR is set to 5 seconds. Should that change?

References

This PR is built on top of #209 (see first commit) and supersedes it.

Docs on the attribute: http://requests.kennethreitz.org/en/master/user/advanced/#id16

Testing

Followed the idea on this comment #209 (comment)

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[adamjmcgrath]

lgtm - it's a shame there isn't a global/environmental variable way of setting the timeout in requests