Updates version number to 0.4.178277830.20171207.
Updates version number to 0.4.178277830.20171207.

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PiperOrigin-RevId: 178278492
MOS_MIGRATED_REVID=178278492

bazelbuild/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi