Sepiida

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Add the environment module for parsing environment variables

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Fix more about missing session properties

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Fix several minor bugs with session reuse

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Allow for sentry to work in services that don't use user sessions

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Add a new fixture, disable_session_reuse, which can be used to disable reusing of sessions when making requests. This is useful
for some projects that have unit tests that "behave badly" when performing session reuse and using httpretty

Also, when making requests we now return the Request-ID for all requests back in the headers of the response. This is to aid in debugging

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Add the request.add_request_handler(app) function which shows a log of the total delay time spent doing HTTP requests