Moved a file.

* test/unit/memory/polymorphic_allocator/jamfile: New.
* test/unit/memory/polymorphic_allocator_run.cpp
  -> test/unit/memory/polymorphic_allocator/default_value_run.cpp: Moved.
Merge pull request #19 from Cryolite/feature/polymorphic_allocator_test

Moved a file.