Update README.md
Update README.md
Updates CoverageDoctor repair and tests.

Aligns repair with analyze and CM work flow.
Modifies test for recovery based on new work flow.
Adds checks for corrupted file before calculating the size ratio.
Replaces original repair def with repair_metadata, renamed to repair
Removes log.warn statement
Adds timestamp to backup files.
Adds auto-rollback on repair failure.

If the repair fails the CM will be rolled-back to the pre-repair file state and backup files removed.
Adds runtime options to repair.

Adds option turn the file backup on or off.
Adds option to run in sandbox mode by turning copy_over to false.
Adds option to leave temporary coverage location intact.
Suppresses default subprocess error output.

Suppresses the default subprocess error output encountered when checking the validity of a corrupt HDF5 file.
Removes ugly print statement.
Adds checkpoint for missing or incorrect h5stat.
Merge pull request #89 from oceanzus/cov_dr_enhancements

CoverageDoctor Updates
Adds ComplexCoverageType.TEMPORAL_BROADCAST

Adds ComplexCoverage type 'TEMPORAL_BROADCAST' - combines multiple coverages along the temporal geometry of one (the first) coverage.  Temporal geometry for the other coverages are aligned with the nearest timestamp of the 'primary' coverage and then forward-broadcast until the next match is seen.
Adds test for TEMPORAL_BROADCAST

Adds test_temporal_broadcast
Fixes minor bug in TEMPORAL_BROADCAST

Addresses minor bug with how head_coverage_path was being reported in the TEMPORAL_BROADCAST ComplexCoverage type:  was None, should be that of the first reference coverage

Expands test_head_coverage_path