'**SUMMARY**
This function crops the source image to the location of the feature and returns
a new SimpleCV image.
**RETURNS**
A SimpleCV image that is cropped to the feature position and size.
**EXAMPLE**
>>> img = Image("../sampleimages/EdgeTest2.png")
>>> l = img.findLines()
>>> myLine = l[0].crop()'

def crop(self):

    tl = self.topLeftCorner()
    return self.image.crop(tl[0], tl[1], self.width(), self.height())
