Updates version number to 0.4.131872896.20160831.
Updates version number to 0.4.131872896.20160831.

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MOS_MIGRATED_REVID=131874131

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