Updates version number to 0.3.124747289.20160613.
Updates version number to 0.3.124747289.20160613.

Significant changes:
- Xcode schemes are now generated for test_suite targets,
  containing all of the tests used in the target.
- Reduced verbosity of the build script, making it slightly
  easier to read and removing Xcode as a bottleneck during IPA
  extraction.
- Added walkthrough documentation at
  http://tulsi.bazel.io/docs/walkthrough
- The --workspaceroot option for command-line builds is no longer
  necessary (and will spawn a deprecation warning).

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MOS_MIGRATED_REVID=124748056

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