调整首页和搜索页的商品显示数目

Change-Id: If69ce56551ae1652183584bdf16f465b7c990810
Merge branch 'master' of https://github.com/Hahn-/GdutExchange.git

Conflicts:
	Lib/Action/Home/SearchAction.class.php
	Lib/Action/Home/ShowAction.class.php

Change-Id: Ibe4855f89b8541784cba13dfcab1152674aa0b4f