Added support for the multimap in the TestApp
Merge pull request #1020 from pveentjer/improvement/3.x/testapp-multimap

Added support for the multimap in the TestApp
fixes #1019
removed the optimization: putting evictable null when mapstore.load() returns null
users can easily add such optimization to their mapstore implementation.
meanwhile internal optimization causes bugs
Merge pull request #1023 from enesakar/mast/fix1019

fixes #1019
Fixes #1024
Typo.
Merge pull request #1026 from mdogan/fix/3.2/1024

Fixes #1024