Refactor: Remove autoloading of 'credential' YAML files

This was completely unnecessary and Chamber provides enough flexibility without
this feature.

Closes #7

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Change-Id:     I9961cc08574343273e1b1230e3cbecceeb4647af
Signed-off-by: Jeff Felchner <accounts+git@thekompanee.com>
Docs: Add git commit hook to prevent insecure settings from commit

Closes #10

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Change-Id:     I45f7f8800165e64155604830a363197e943b2fd7
Signed-off-by: Jeff Felchner <accounts+git@thekompanee.com>