'**SUMMARY**
Return the aspect ratio of all the features in the feature set, For our purposes
aspect ration is max(width,height)/min(width,height).
**RETURNS**
A numpy array of the aspect ratio of the features in the featureset.
**EXAMPLE**
>>> img = Image("OWS.jpg")
>>> blobs = img.findBlobs(128)
>>> print blobs.aspectRatio()'

def aspectRatios(self):

    return np.array([f.aspectRatio() for f in self])
