Fix maxHeaderBytes env variable name + linting fix (nytimes#415)

* Fix maxHeaderBytes env variable name + linting fix

* fix key-set tests

Expose GCP PubSub PublishSettings to Gizmo users (nytimes#239)

Log the panic message even if it's not of type error (nytimes#237)

fix typo in the MessageAttributes method (nytimes#236)

Allow to set SNS Message Attributes via context (nytimes#235)

* Allow to set SNS Message Attributes via context

* use private context key as suggested by @jprobinson

Detect cloud run for stackdriver logging (nytimes#234)

* Added cloud run detection

* Refactored GetServiceInfo, added Run resource type

* Removed debug code

* Updated docs

* Updated naming to be more clear

* Updated readme

* Renamed func

[auth/gcp] Adding basic google web auth flow capabilities (nytimes#231)

* initial WIP

* removing IAM verifier, cleaning up verify logic

* docs

* hooking in custom exception func

* renaming file

* removing unneeded client

* ensuring cookie is cleared

* cleaning up var declarations

* fixing the logger

* Forbids instead of redirecting

* cleaned up verify logic

* state cleanup

* simplifying logic

* avoiding a verify of an empty token

* adding some initial authenticator tests, callback still needs coverage

* adding some callback tests

* making notes in README

add http listen addr to config (nytimes#230)

* go fmt

* add HTTPAddr to config to allow configuring listen address

[server/kit] Adding log "format" functions that mimic `appengine/log` (…

…nytimes#229)

* tidying up example deps

* adding log*f funcs for the kit server

* variable firx

* adding more test logging

* DRY-ing things up a tad

tidying up example dependencies + updating go-kit (nytimes#227)

* tidying up example deps

* updating go-kit

* also updating example go-kit