'**SUMMARY**
Test circle distance against a tolerance to see if the blob is circlular.
**PARAMETERS**
* *tolerance* - the percentage difference between our blob and an ideal circle.
**RETURNS**
True if the feature is within tolerance for being a circle, false otherwise.'

def isCircle(self, tolerance=0.05):

    if (self.circleDistance() < tolerance):
        return True
    return False
