BUG: Use samplingPercentage in BFit tests and replacing baselines

The "numberOfSamples" is replaced by "samplingPercentage" option in all
BRAINSFit tests. Also, 17 old baselines are replaced by the new files.
Merge pull request #125 from aghayoor/bfitSamplingPercentage

BUG: Use samplingPercentage in BFit tests and replacing baselines