Fixed errors in DissimilarityMultiRegressMeasure#1

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swaroopgj wants to merge 2 commits intoandycon:masterfrom

Commits on Jan 23, 2014

BF: DissimilarityMultiRegressMeasure doesn't initialize X
swaroopgj
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ENH: Modified the return dataset of DissimilarityMultiRegressMeasure
swaroopgj
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