Merge pull request notaryproject#1076 from cyli/changelog-update

Update changelog and version for 0.4.4

Merge pull request notaryproject#1067 from riyazdf/delegation-key-imp…

…ort-export

Fix delegation key import/export GUN inference logic

Release v0.5.0

Finished hotfix 0.4.2.

Finished hotfix 0.4.1.

Finished release 0.4.0.

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unify KeyMemoryStore and KeyFileStore in trustmanager

Signed-off-by: David Lawrence <[email protected]> (github: endophage)

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