poppler 0.23.2 发布，生成 PDF 的C++类库

Poppler 是一个用来生成 PDF 的C++类库，从xpdf 继承而来。它使用了很多先进的类库例如 freetype 和 cairois 来达到更好的输出效果，同时也提供了一组命令行工具包。

发布说明: SplashOutputDev is now 10 times faster at some tiling. Caching of lcms2 ICC color profiles was improved. Some private classes were moved into an anonymous namespace. A thread stresser tool was added to the Qt4 frontend. The mingw build was fixed