Fix test failures of BRAINSConstellationDetector

Some of the BCD tests were failing because of recent changes on how we
write float numbers as strings.
The results have not changed; just the way they are presented (the
    precision of the floating numbers) have changed. Therefore, I just
replaced the previous baselines by the modified versions.
Merge pull request #199 from aghayoor/BCD_testFailure

Fix test failures of BRAINSConstellationDetector