Hui

Results 3 issues of Hui

![hwnri_7u749e c 25 xt90](https://user-images.githubusercontent.com/16596135/32031411-aa77e68e-ba33-11e7-8be1-665a07d63e83.png)

**Describe what happened:** the first line of py code `from xxx import play` **Describe what you expected:** the xxx is a so file. Run the py script in command line...

BFS search is more efficient For some website like blog and some news website Can you guys add a feature make colly support BFS search.Thanks.