CKEditor 4.5.9 发布，Bugs 修复版本

CKEditor 4.5.9 发布了，这是一个小版本发布，主要修复一些Bugs，以及CKEditor生成器的更新。

主要Bugs修复：

#10685: Fixed: Unreadable toolbar icons after updating to the new editor version.
#14573: Fixed: Missing Widget drag handler CSS when there are multiple editor instances.
#14620: Fixed: Setting both the min-height style for the <body> element and the height style for the <html> element breaks the Auto Grow plugin.
#14538: Fixed: Keyboard focus goes into an embedded <iframe> element.
#14602: Fixed: The dom.element.removeAttribute() method does not remove all attributes if no parameter is given.
#8679: Fixed: Better focus indication and ability to style the selected color in the color picker dialog.
#11697: Fixed: Content is replaced ignoring the letter case setting in the Find and Replace dialog window.
#13886: Fixed: Invalid handling of the CKEDITOR.style instance with the styles property by CKEDITOR.filter.
#14535: Fixed: CSS syntax corrections. Thanks to mdjdenormandie!
#14312: [IE] Fixed: Artifact is visible after pasting any text.