Talisker

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* add support for postgresql via psycopg2 (85). This will add breadcrumbs to
sentry reports, as slow query logs.
See http://talisker.readthedocs.io/en/latest/postgresql.html for more info

* Access log cleanups (94). We no longer include the querystring in the
logmsg, just as a field.

* Improved proxy handling in private endpoints. (92). Fixes X-Forwarder-For handling.

* Clear sentry context on request start (90). This stops some breadcrumbs
bleeding between requests.

* Fix sentry default config when used with flask (89). This was causing
release tag to not be applied to sentry reports.

* truncate long log messages (86). This prevents DOSing logstash.

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* require explicit DEVEL env var to enable colored output.

* Add ability to force switch colors off with TALISKER_COLOR=no

* Fix bug in grok filter to allow _ in logger name

* Drop log tags that are empty, as logstash can't cope with them

* Truncate very long log messages and tags (at 10k/2k respectively) to avoid accidental DOS.

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* Fix gunicorn logger metrics and logging, adding tests (75)

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Bug fix release

* Fix celery metrics with eager tasks (70)
* Fix statsd cli args and metric format (71)
* Also fix depencecies on recent setuptools

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This release has a couple of important bugfixes, upgrading is strongly encouraged.

* Feature: Add a generic script runner to run any python script with
talisker logging, primary usecase is django managment commands:

talisker.run myscript.py ...

* Improvement: DEVEL env var is no longer required (although still respected).
Talisker will assume DEVEL mode when stderr is a tty.

* Bugfix: re-add http metrics for gunicorn which were accidentaly dropped in
a refactor, with regression tests

* Bugfix: fix celery integration with 3.1.13+, with regression tests

* Bugfix: Add missing request_id to new accesslogs

* Bugfix: Fix issue 35, respect --log-level for gunicorn in DEVEL mode. This
means you can do --log-devel=debug and get debug level logging to your
console.

* Improvement: support raven 6

* Testing: now testing against pypy in CI, and also agains the minimum
supported versions of various dependencies too, to help prevent further
accidental dependencies on latest version apis (which is what broke celery
3.1.x integration)

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The major feature in this release is support for sentry, which is integrated
with wsgi, logging, and celery. Also supports opt-in integration with
flask and django, see the relevant docs for more info.

Other changes

* refactor of how logging contexts were implemented. More flexible and
reliable. Note `talisker.logs.extra_logging` and
`talisker.logs.set_logging_context` are now deprecated, you should
use `talisker.logs.logging_context` and
`talisker.logs.logging_context.push`, respectively, as covered in the
updated logging docs.

* improved celery logging, tasks logs now have task_id and task_name
automatically added to their logs.

* improved logging messages when parsing TALISKER_NETWORKS at startup