Bugfix: Explicitly require YAML

Evidently Rails 4.1 no longer requires the 'yaml' standard library so now we
have to do it manually.

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Change-Id:     I608b152de0b46d3d23f20d08410bf266a9f80014
Signed-off-by: Jeff Felchner <accounts+git@thekompanee.com>
Version Bump to 0.38.0