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

def maxX(self):

    self._updateExtents()
    return self._mMaxX
