test algorithm for most specific category

<img src="https://gravatar.com/avatar/a977f37449ef17ca0dc91a4e36fd894d?d=https%3A%2F%2Fgithub.ugent.be%2Fidenticons%2F202cb962ac59075b964b07152d234b70.png&r=x" align="left" width="96" height="96" hspace="10"></img> **Issue by svlandeg**
_Sat Nov 29 16:30:33 2014_

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In EdgeComparison.getDifferentialEdge:

while (consensusClean.size() > 1)

can't this generate an infinite loop? Test!
