Merge branch 'dev' (0.3.9 features) into 'master'

Enhancements:
* Improved zooming support for high DPI settings.

Bug fixes:
* "Backup all rules and subscriptions" should work properly now.
* Allow disabling redirection of IE Temporary Files and Cookies, which resolves some rendering glitches.
* Resolve the issue that sometimes the profile folder cannot be deleted when using a portable version of Firefox with redirection of IE Temporary Files and Cookies enabled.
* ABP support: resolved a memory leak issue in processing of element hiding rules.
* Switch rules will no longer affect the "Get Add-ons" tab in the Add-ons Manager.
* Fixed: forward button not shown in Firefox 29.
* Fixed: switch rules don't work for URLs without a host name.

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功能改进：
* 改进高DPI下的缩放支持。

Bug修复：
* “备份所有切换规则与订阅”功能现在能够正常工作。
* 允许用户关闭IE临时文件和Cookie重定向，可以解决一部分网页渲染问题。
* 解决开启IE临时文件和Cookie重定向时，无法删除便携版配置文件夹的问题。
* ABP支持：解决处理元素隐藏规则时引起的内存泄漏。
* 切换规则不再影响附加组件管理器的“获取附加组件”标签页。
* 修复“前进”按钮在Firefox 29上不显示的问题。
* 修复切换规则对无域名的URL不起作用的问题。

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Please wait for translations from [babelzilla](http://www.babelzilla.org/forum/index.php?showtopic=7464) before merging this pull request.