add agesture to the touch draw view and removed the effect of a tap to drawing a line
change color of the line if it is selected, i.e. it satisfies the selected line point apporximation criteria
implemented the UIMenuController with a delete item, the UIMenuCOntroller is made visible at the point of touch via the gesture recognizer, we added the delete menu item to it, we declare that the delete action be called on selection of the menu item, this method removes the line from the completed lines array
long gesture recognition, removal of menu if still visible
implemented pan on hold, handlin multiple recognizers and sharing touch events