No more typeless decorations

Now you can specify a list of types with your decoration.

src/decoration.coffee

@@ -12,5 +12,7 @@ class Decoration
     @marker?.isValid()
 
   isType: (decorationType) ->
-    return true unless @type
-    decorationType is @type
+    if _.isArray(@type)
+      decorationType in @type
+    else
+      decorationType is @type

src/editor.coffee

@@ -1233,7 +1233,7 @@ class Editor extends Model
   addCursor: (marker) ->
     cursor = new Cursor(editor: this, marker: marker)
     @cursors.push(cursor)
-    @addDecorationForMarker(marker, {class: 'cursor-line'})
+    @addDecorationForMarker(marker, type: ['gutter', 'line'], class: 'cursor-line')
     @emit 'cursor-added', cursor
     cursor