initial import
adding support for recursive tweening of maps & seqs and function wrapped values (for auto-animated tween targets), renaming `value-at` into `at`, splitting out value resolution into `resolve-value` & `tween-value` multi-method
Merge branch 'master' of github.com:thi-ng/tweeny

* 'master' of github.com:thi-ng/tweeny:
  Initial commit