Updates version number to 0.4.166198696.20170823.
Updates version number to 0.4.166198696.20170823.

Significant changes:
- Tulsi now uses BEP in bazel_build.py.
- Minor improvements to Bazel path handling.

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PiperOrigin-RevId: 166199861
MOS_MIGRATED_REVID=166199861

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