Implement different recursion modes as statemachine and have an optional
parameter to choose the mode in the constructor.

Major update:
- Remove all overloading hooks -> array_read/array_access must be rewritten
- Remove all basic iterators
- Remove all 'spl_' prefixing exposed to user level
- Add Recurs

Major update:
- Remove all overloading hooks -> array_read/array_access must be rewritten
- Remove all basic iterators
- Remove all 'spl_' prefixing exposed to user level
- Add RecursiveIterator, RecursiveIteratorIterator
- Add DirectoryIterator, DirectoryTreeIterator
- Add some examples

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