增加推荐书目功能

1、RT
2、关于Major的算法问题一直不能解决，故删除该功能，后面再继续研究
Merge branch 'develop' of https://github.com/daydreamqian/BookExchangeMarket into develop

Conflicts:
	src/com/vwdqproduction/bookexchangemarket/Fragment_HostDetail.java