iterator prefetch
iterator prefetch
Merge branch 'master' into develop

Conflicts:
	test/de/caluga/test/mongo/suite/IteratorTest.java
Merge branch 'master' into develop
measuring times
Merge branch 'master' into develop
prefetching iterator
iterator
almost there...
prefetching iterator
prefetching iterator
prefetching iterator
prefetching iterator
prefetching iterator
interator threadsafe