Adding check to see if rangy is being used as an interface, and using…

… that if possible.

per openannotation#4

src/range.coffee

@@ -278,7 +278,10 @@ class Range.NormalizedRange
   #
   # Returns a Range object.
   toRange: ->
-    range = document.createRange()
+    # If we're using the rangy library for older browsers, use that.
+    # Otherwise just use document.
+    doc = rangy ? document
+    range = doc.createRange()
     range.setStartBefore(@start)
     range.setEndAfter(@end)
     range

src/util.coffee

@@ -87,7 +87,10 @@ Util.contains = (parent, child) ->
 # value of the selection. What this returns is very close to what the user
 # actually sees.
 Util.readRangeViaSelection = (range) ->
-  sel = Util.getGlobal().getSelection() # Get the browser selection object
+  # If we're using the rangy library for older browsers, use that.
+  # Otherwise get window from the global space.
+  win = rangy ? Util.getGlobal()
+  sel = win.getSelection() # Get the browser selection object
   sel.removeAllRanges()                 # clear the selection
   sel.addRange range.toRange()          # Select the range
   sel.toString()                        # Read out the selection

test/spec/range_spec.coffee

@@ -214,13 +214,15 @@ describe 'Range', ->
           setStartBefore: sinon.spy()
           setEndAfter: sinon.spy()
 
-        sinon.stub(document, 'createRange').returns(mockRange)
+        doc = rangy ? document
+
+        sinon.stub(doc, 'createRange').returns(mockRange)
         r.toRange()
 
-        assert(document.createRange.calledOnce)
+        assert(doc.createRange.calledOnce)
         assert(mockRange.setStartBefore.calledOnce)
         assert.isTrue(mockRange.setStartBefore.calledWith(r.start))
         assert(mockRange.setEndAfter.calledOnce)
         assert.isTrue(mockRange.setEndAfter.calledWith(r.end))
 
-        document.createRange.restore()
+        doc.createRange.restore()