Add m.redraw() support for multiple mount points

To better match `0.2.x` behavior: https://jsfiddle.net/xbpyqL9k/

api/tests/test-redraw.js

@@ -0,0 +1,55 @@
+"use strict"
+
+var o = require("../../ospec/ospec")
+var createRedraw = require("../../api/redraw")
+
+o.spec("m.redraw", function() {
+    var redraw, renderers
+	
+	o.beforeEach(function() {
+		renderers = []
+		redraw = createRedraw(renderers)
+	})
+    
+    o("it shouldn't error if there are no renderers", function() {
+        redraw()
+    })
+    
+    o("it should run a single renderer entry", function() {
+        var spy = o.spy()
+        
+        renderers.push(spy)
+        
+        redraw()
+        
+        o(spy.callCount).equals(1)
+        
+        redraw()
+        redraw()
+        redraw()
+        
+        o(spy.callCount).equals(4)
+    })
+    
+    o("it should run all renderer entries", function() {
+        var spy1 = o.spy()
+        var spy2 = o.spy()
+        var spy3 = o.spy()
+        
+        renderers.push(spy1, spy2, spy3)
+        
+        redraw()
+        
+        o(spy1.callCount).equals(1)
+        o(spy2.callCount).equals(1)
+        o(spy3.callCount).equals(1)
+        
+        redraw()
+        redraw()
+        redraw()
+        
+        o(spy1.callCount).equals(4)
+        o(spy2.callCount).equals(4)
+        o(spy3.callCount).equals(4)
+    })
+})