added .dylib files to gitignore
added .dylib files to gitignore

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