Added most heap method signatures.

Working on flat matrix transpose using strides and shapes (a la numpy). Took a break to work on some heaps from CLRS.

Working on mult; moving towards custom matrix errors.

Implemented some basic ops.

Index offset and indexing done.

Started Matrix class, considering GenericArray vs Vec for underlying data structure.

Fleshed out tests and added an accidentally removed method from LinkedList<T>.

Finished doubly linked list and associated tests.

Converted singly linked list to Rc; started doubly linked.

Refactoring; added list tests.

README updates. Added standard list methods to List.

Added README text; added LICENSE.

Initial commit.