CLIMATE-484 - Remove rebinning metrics

- Drop SpatialStdDevRation, TemporalPatternCorrelation,
  SeasonalSpatialStdDevRation, and SeasonalPatternCorrelation.
CLIMATE-484 - Remove rebinning metrics from tests
CLIMATE-484 - Remove rebinning metrics from examples.
Resolve CLIMATE-484. Merge PR #86.
CLIMATE-489 - Add better subset error reporting

- Bounds checking now builds a list of errors and reports all offending
  bounds values in a single ValueError.
- Update subset docstring to reflect change in return value. Only True
  is returned when the subset is valid, otherwise a ValueError is
  raised.
Resolve CLIMATE-489. Merge PR #87.