Add commit format autoreviewing

[LeagueSandboxBot]

Automatically review PRs and their commit message formats

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Beep, boop, I'm a bot! This issue was created by @Mythic in #development.

[MythicManiac]

This could be implemented either via a webhook to Blitzcrank directly, or hooking Blitzcrank somehow up with Travis/Appveyor. Former one preferred for whole organization wide automated reviewing.