Merge pull request #2 from NicolaasVB/master

added iterator_reduce
Added ProcessCsvIterator
Fixed bug in process csv iterator
Fixed bug in filecsviterator
Added BatchMapIterator
MIN [ALL] Major enhancements to BatchMapIterator
Added invocationlimit to callbackiterator
Fixed stopwatchiterator autoprint
Fixed bug in lookaheaditerator
Added InnerExposingIterator
Added PDOStementIterator
Added FlippingIterator
added ignoreFirstRow support for CsvIterators