some coffee idioms, common constructor change

lib/morris.area.coffee

@@ -29,7 +29,7 @@ class Morris.Area extends Morris.Line
         else
           total += (y || 0)
           @transY(total)
-      row._ymax = Math.max.apply Math, row._y
+      row._ymax = Math.max row._y...
 
   # draw the data series
   #

lib/morris.donut.coffee

@@ -29,16 +29,14 @@ class Morris.Donut extends Morris.EventEmitter
   # Create and render a donut chart.
   #
   constructor: (options) ->
-    if not (this instanceof Morris.Donut)
-      return new Morris.Donut(options)
+    return new Morris.Donut(options) unless (@ instanceof Morris.Donut)
+    @options = $.extend {}, @defaults, options
 
     if typeof options.element is 'string'
       @el = $ document.getElementById(options.element)
     else
       @el = $ options.element
 
-    @options = $.extend {}, @defaults, options
-
     if @el == null || @el.length == 0
       throw new Error("Graph placeholder not found.")
 
@@ -88,7 +86,7 @@ class Morris.Donut extends Morris.EventEmitter
     @text1 = @drawEmptyDonutLabel(cx, cy - 10, @options.labelColor, 15, 800)
     @text2 = @drawEmptyDonutLabel(cx, cy + 10, @options.labelColor, 14)
 
-    max_value = Math.max.apply(null, value for value in @values)
+    max_value = Math.max @values...
     idx = 0
     for value in @values
       if value == max_value

lib/morris.grid.coffee

@@ -139,8 +139,8 @@ class Morris.Grid extends Morris.EventEmitter
     ymin = if @cumulative then 0 else null
 
     if @options.goals.length > 0
-      minGoal = Math.min.apply(null, @options.goals)
-      maxGoal = Math.max.apply(null, @options.goals)
+      minGoal = Math.min @options.goals...
+      maxGoal = Math.max @options.goals...
       ymin = if ymin? then Math.min(ymin, minGoal) else minGoal
       ymax = if ymax? then Math.max(ymax, maxGoal) else maxGoal
 
@@ -188,8 +188,8 @@ class Morris.Grid extends Morris.EventEmitter
     @events = []
     if @options.parseTime and @options.events.length > 0
       @events = (Morris.parseDate(e) for e in @options.events)
-      @xmax = Math.max(@xmax, Math.max.apply(null, @events))
-      @xmin = Math.min(@xmin, Math.min.apply(null, @events))
+      @xmax = Math.max(@xmax, Math.max(@events...))
+      @xmin = Math.min(@xmin, Math.min(@events...))
 
     if @xmin is @xmax
       @xmin -= 1

lib/morris.line.coffee

@@ -52,7 +52,7 @@ class Morris.Line extends Morris.Grid
       row._x = @transX(row.x)
       row._y = for y in row.y
         if y? then @transY(y) else y
-      row._ymax = Math.min.apply(null, [@bottom].concat(y for y in row._y when y?))
+      row._ymax = Math.min [@bottom].concat(y for y in row._y when y?)...
 
   # hit test - returns the index of the row at the given x-coordinate
   #