Talisker

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* Fix a regression that broke prometheus metrics in multiprocess environments.

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* Change default slow query threshold to -1 even in DEVEL (226)
* Move the clearing of various request contexts as late as possible (233)
* add soft request timeout support (231) - thanks to Guillermo Gonzalez
* support raven 6.9.0 (232) - thanks to Guillermo Gonzalez

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This release collects a number of bugfixes

* Make parsing the postgres dsn more robust (224)
* Protect django middleware view introspection (220) (thanks to tomwardill)
* Ensure that configured sentry processors is a set (219) (thanks to tomwardill)
* Fix link escaping in objgraph page (217)

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The main feature in this release is new endpoints for debugging (213):

* /_status/info/packages: show a list of installed python packages and versions
* /_status/info/workers: show resource usage of gunicorn workers, and general process infomation [requires psutil]
* /_status/info/objgraph: show python object counts and potential leaks [requires objgraph]

These endpoints are IP restricted to TALISKER_NETWORKS, and can render as text via curl or html via browser.

* Renamed all structured logging fields called "duration" to "duration_ms" to indicate units (215)
* Unknown /_status/ urls are passed through to app, to allow for 404 format control by the app (212)
* We only quote logfmt stings if needed, reduces visual noise on log lines (173)
* DEVEL colorscheme improved to support light terminals, and a simpler option that doesn't use italics or bold (188)
* log request size/type in gunicorn logs (174)
* Added support for flask 1.0 and prometheus client 0.2, make django 1.10 the minimum supported version (209, 198)

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The main work in this release has been improvments to metrics.

* Collect prometheus metrics as well as statsd for gunicorn, requests, and celery (172)
* Support flask/django adding X-View-Name header to indicate view function (151)
* Control over naming requests metrics (171)
* Gunicorn logging enhancements (165)
* Gather better metadata from OSError exceptions
* Fixed some small logging issues

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* The logfmt output has been reworked to explictly quote strings, and test
coverage much improved in the process. This allows for more robust parsing
in logstash, such as allowing numeric fields.

* New talisker.testing module, which has helpers for functionally testing
talisker servers and related talisker tools.

* Added a functional test suite using the new talisker.testing helpers

* Custom ruby logstash filter to handle parsing of numeric values and escaped quotes.