Merge pull request #38 from henryouly/master

Add xueqiu hot topics 雪球今日热点
1.9.4

1.appspotmail邮箱支持抓取多链接生成电子书
2.增加内置书籍《TED渤海湾》(也是抓取传送门文章的例子)
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1.appspotmail supports fetch multi-hyperlinks to generate ebook (refers
to FAQ)
2.add book 'TEDxBohaiBay'