Update partitioning-big-data.txt
Update partitioning-big-data.txt

Add in a note about the default parsing behaviour of load-graph.py when there is no recognised file extension.
kdmurray91/khmer,kdmurray91/khmer,F1000Research/khmer,souravsingh/khmer,Winterflower/khmer,souravsingh/khmer,ged-lab/khmer,souravsingh/khmer,jas14/khmer,Winterflower/khmer,ged-lab/khmer,Winterflower/khmer,jas14/khmer,jas14/khmer,ged-lab/khmer,F1000Research/khmer,F1000Research/khmer,kdmurray91/khmer