removed erroneous setup
updated to use FetchingIterator
IterationAdapter now returns correct item property when iterating keys
fetching iterator now accepts raw array
missing $this
Some more generic iterators to support 5.4
APC key iteration now no longer uses the key from the unserialised item value
PDO connector now clonable
PDO MySQL unbuffered iteration option
(not sure about this crappy memory test - need to work out a better way)