Added a test to make sure committed allocations our of custom pools work as committed
Added a test to make sure committed allocations our of custom pools work as committed

See #24

GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator,GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator,GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator