Merge pull request #2 from supernullset/add-get-index-and-update-types

forgot to add the index tests for the lazy seq

minor test updates

minor test updates

Remove immutable constraint on Cat

Use immutable. Fix a couple things.

Rename Seq to LazySequences.

README clarifications.

Seq over IO types yielding a lazy sequence of characters.

Add LICENSE, add some README bits.

Get some basics working.

First commit.