Added pre_bug label metrics for analysis.

Changes:

Added to the ReleaseFilepath schema:

- num_pre_features
- num_pre_compatibility_bugs
- num_pre_regression_bugs - which is now based on type-bug-regression label
- num_pre_security_bugs
- num_pre_tests_fails_bugs
- num_pre_stability_crash_bugs
- num_pre_build_bugs

Updated test data and verifies to populate the added fields. Next steps is to create verifies for the new fields.
This refers to issue #197