修正空余课室 显示NULL的问题，修正考试信息的缓存问题
应用汇 改成 其他
Merge branch 'macro_dev' of https://github.com/iSCAU/iSCAU-Android into macro_dev

Conflicts:
	app/src/main/java/cn/scau/scautreasure/ui/Exam.java
	app/src/main/java/cn/scau/scautreasure/ui/OrderFood.java