Two methods for adding inflection callbacks.

Specify the index yourself or get the current one.
WIP test cleanup.
Rearranging, adding tests.
Test cleanup continues.

Added procedural and accumulate phrase tests.
Updating tests. Fixed makeReverse.
Cleaning up timeline tests.
Cue test cleanup.
Removing duplicate cue tests.

Don't need all the tests in the world.
Cleaning up and attempting 'literate' tests.
Motion slicing tests/explanations.

Hopefully this test file will be useful as documentation, too.
Callback method test cleanup.
Update README.
MixPhrase test.
Clip phrase tests, bugfix.
Expand clip phrase tests.
Testing Sequence slicing.

Failing past end of sequence.
Fix Sequence slicing past end.

Tests now pass.
Slicing test cleanup.
Cut tests more descriptively named.
Rename Timeline duration calculation.

Time until finish is more accurate.
Small bugfix in test.