Scale to/from zero and use containerd for state

Changelog for 0.5.4:

• PR #29 Scale from zero and to zero when required by @alexellis
• PR #21 Use containerd as source of truth by @carlosedp

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Extract CNI networking into its own handler

Changelog for 0.5.3:

• PR #26 Extract CNI networking into its own handler by @carlosedp

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Fix error handling for CNI errors

Changelog for 0.5.2:

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Fix CNI config load and configuration

Changelog for 0.5.1:

• PR #23 Fix CNI config load and configuration. by @carlosedp

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Move to CNI for networking

Changelog for 0.5.0:

• PR #18 Ported networking to CNI. Removed netns dependency. by @carlosedp
• PR #17 Document how to enable basic auth by @LucasRoesler
• PR #14 Update README for latest version by @Darkflib

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Enable basic auth env-var

Changelog for 0.4.0:

• PR #12 Enable basic auth env variable config by @LucasRoesler

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Add info endpoint

Changelog for 0.3.3:

• PR #11 Update faas-provider and implement info handler by @LucasRoesler

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Release without namespaces in API

Changelog for 0.3.2:

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Extract handlers package and use common code with faasd

Changelog for 0.3.1:

• PR #9 Add handlers package by @alexellis

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Keep functions up forever and add service_timeout

Changelog for 0.3.0:

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