Youssef darzi

Use bx-python==0.8.8 to fix ImportError in som.py By default python==0.8.9 is installed and causes the following error: `ImportError: /usr/local/lib/python2.7/dist-packages/bx/intervals/intersection.so: undefined symbol: PyUnicodeUCS2_FromStringAndSize`

Everything above KO level is not mapped and an empty results is returned

The barchart display for KOs seems random for the modulecoverage series 

Add a legend to show the colors of each sample in the mapped barcharts.