Creates the north pointer relative to current heading.

def createNorthPointer(self):
        '''Creates the north pointer relative to current heading.'''
        self.headingNorthTri = patches.RegularPolygon((0.0,0.80),3,0.05,color='k',zorder=4)
        self.axes.add_patch(self.headingNorthTri)
        self.headingNorthText = self.axes.text(0.0,0.675,'N',color='k',size=self.fontSize,horizontalalignment='center',verticalalignment='center',zorder=4)