updated memoryview test to skip on Py 2.6.2
updated memoryview test to skip on Py 2.6.2

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