change default stroke_linecap styling for all shapes

so that it matches the style used when drawing lines. remove opacity
setting for lines being drawn.

disable scroll events to prevent zooming when doing fast swiping in
surface pro 3 (windows 8.1)

in addition, reduce default expansion ratio to 1.0 from 3 (the
width/height of the drawing area was 3 times the width/height of the svg
drawing)
remove css rules for smaller screen

and right margin for the editing area
change default stroke width to 3 from 5 and blue ink
terminate in progress action when touch gestures happens

panning/pinch zooming gestures in IE would not generate a mouseup event,
so we have to listen to pointercancel event to cleanup internal state
change background of drawing area to white

and use dotted lines around the original box of the svg drawing
press and hold lower side button to select and delete selected shapes

ctrl+left mouse does the same thing