chore(Viewer): compress code

lib/Viewer.js

@@ -50,9 +50,7 @@ function Viewer(options) {
 
   var parent = options.container || $('body');
 
-  var container = $('<div></div>').addClass('bjs-container').css({
-    position: 'relative'
-  }).appendTo(parent);
+  var container = $('<div class="bjs-container" style="position: relative"></div>').appendTo(parent);
 
   container.css('width', options.width || '100%');
   container.css('height', options.height || '100%');