'**SUMMARY**
This method return the maximum y value of the bounding box of the
the feature.
**RETURNS**
An integer value of the maximum y value of the feature.
**EXAMPLE**
>>> img = Image("OWS.jpg")
>>> blobs = img.findBlobs(128)
>>> print blobs[-1].maxY()'

def maxY(self):

    self._updateExtents()
    return self._mMaxY
