RedBlack: provide InOrder function

Merge pull request #6 from obitech/rb-keys

RedBlack: Allow arbitrary keys

Merge pull request #5 from obitech/gaps

Interval tree: add Successor function

Interval tree: rename type, provide InOrder function that yields all …

…results

interval: provide FindExact function

Update module path

Merge pull request #4 from obitech/interval-tree

Add Interval Tree

Merge pull request #1 from obitech/redblack

Add red-black Tree