Use 'annotator-hl' class for temporary highlights.

- Fix for bug introduced by 033c012

- Spotted by Eric Collins (@tabfugnic) The "span" for the temporary
  highlight wasn't being ignored by Range.NormalizedRange#serialize()
  and was being included in the submitted XPath for the annotation,
  resulting in a failure to redraw the annotation on page load

Signed-off-by: Nick Stenning <nick@whiteink.com>

src/annotator.coffee

@@ -647,7 +647,7 @@ class Annotator extends Delegator
     # Show a temporary highlight so the user can see what they selected
     if @selectedRanges and @selectedRanges.length
       ranges = (Range.sniff(r).normalize() for r in @selectedRanges)
-      highlights = this.highlightRanges(ranges, 'annotator-hl-temporary')
+      highlights = this.highlightRanges(ranges, 'annotator-hl annotator-hl-temporary')
 
       @editor.element.one 'hide', ->
         for h in highlights

test/spec/annotator_spec.coffee

@@ -853,7 +853,7 @@ describe 'Annotator', ->
       expect(annotator.showEditor).toHaveBeenCalledWith(annotation, mockOffset)
 
     it "should add temporary highlights to the document to show the user what they selected", ->
-      expect(annotator.highlightRanges).toHaveBeenCalledWith(['normalized', 'normalized'], 'annotator-hl-temporary')
+      expect(annotator.highlightRanges).toHaveBeenCalledWith(['normalized', 'normalized'], 'annotator-hl annotator-hl-temporary')
 
   describe "onEditAnnotation", ->
     it "should display the Annotator#editor in the same positions as Annotatorviewer", ->