Get Animate to 100% coverage

[jwallwork23]

Not far off!

Name                       Stmts   Miss  Cover
----------------------------------------------
animate/__init__.py            8      0   100%
animate/adapt.py              95     32    66%
animate/checkpointing.py      47      3    94%
animate/interpolation.py     178     17    90%
animate/math.py               44      0   100%
animate/metric.py            455     59    87%
animate/quality.py            85      0   100%
animate/recovery.py          116     11    91%
animate/utility.py           131     13    90%
----------------------------------------------
TOTAL                       1159    135    88%

We should set up a coverage check so that code changes aren't allowed to reduce coverage.