(GH-1400) API: Ensure GetChocolatey mutex
(GH-1400) API: Ensure GetChocolatey mutex

When creating GetChocolatey, ensure that it is surrounded by a Mutex to
ensure one creation at a time.

TheBigBear/choco,jberezanski/choco,jberezanski/choco,TheBigBear/choco,TheBigBear/choco,jberezanski/choco