Remove unused "forced" versions.
Rename minifill to web-animations.* and maxifill to web-animations-next.*
Add web-animations-next-lite target

This is basically the same as web-animations-next minus matrix
interpolation, decomposition, and handlers for shape, font-weight and
position.
Simplify target names
Remove unused suffix
Rename test target
Merge pull request #219 from dstockwell/remove-forced

Rename build targets and add web-animations-next-lite