add fast merge rect #66
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原代码中的逻辑是不断寻找两两rect判断他们能不能完成合并，这会导致在处理一些复杂的pdf矢量图的时候耗时极大。我修改成了：1.先排除孤立的长细线(定义为长/宽>8, 且周围有相交bbox数目<2的线) 2.将rect膨胀distance/2(distance是合并判定距离)，然后使用shapely.ops内置的更为高效的unary_union进行统一合并。
实验发现代码能显著提升提升效率。在手动检查了部分部分pdf文件的图片提取情况，发现总体提取情况令人满意，和原版代码相比提取质量并无明显下降
改进后时间分布：
原来的时间分布：
