Methods that do not modify the tree are no longer recursive. The ones that do modify the tree are still recursive so that there are seams for inheritance to use.
The default comparator is now the `compare` method. The constructor now uses it anytime its parameter is not callable instead of only when it is NULL.
Code style change.
Code style change.
Simplified code.
Now throws LookupException when calling `get` with a value that doesn't exist.
Simplified hashing mechanics and visibility.
Adding performance tests.
Renamed some methods for LinkedList.
Updated minimum PHP version requirement to 5.4.11. Added callable type-hints and removed associated TypeExceptions.
Converted to short-array syntax.
Simplified some tests. Renamed some test methods.
Improved Mediator API and added ConditionalMediator.
Merge pull request #5 from morrisonlevi/master

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