1.1.0 — storage manipulation methods, Default impls, refactoring

• Refactored the tree code into more files, making it considerably easier to maintain.
• Added storage manipulation methods to the trees, featuring reserve, num_nodes, capacity and shrink_to_fit.
• Added Default impls for tree types other than BinaryTree, they were missing due to an oversight.

1.0.0 — initial release

Bumped version to 1.0.0

Rolling the release tracks!