Updates version number to 0.3.123657739.20160531.
Updates version number to 0.3.123657739.20160531.

Significant changes:
- Fixed bug preventing proper indexing of generated source files
  that were referenced by their full paths.

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MOS_MIGRATED_REVID=123658252

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