added tests for pmap loading/file type and version
added tests for pmap loading/file type and version

Winterflower/khmer,ged-lab/khmer,kdmurray91/khmer,souravsingh/khmer,kdmurray91/khmer,souravsingh/khmer,ged-lab/khmer,jas14/khmer,Winterflower/khmer,ged-lab/khmer,jas14/khmer,jas14/khmer,souravsingh/khmer,F1000Research/khmer,F1000Research/khmer,Winterflower/khmer,kdmurray91/khmer,F1000Research/khmer