Merge pull request #2 from ds-sww/master

...
size,isEmpty,get,add,remove
fix bugs of remove()
first homework
first commit
修改了文件目录
抽象出了checkSize方法
发现remove忘记返回值了...
hasitu
 writing testcase disability
finish assignment1
Sorry to be a little bit late.
sources of assignment2
initialize assignment3
Merge pull request #151 from SiuTo/assignment3

13307130319_LIANGXIAOTAO_assignment3 [ Initial Commit ]
First version of assignment3
Merge pull request #153 from billlai95/assignment1

13307130346_billlai95_Assignment1
13307130316_Liminjun_assignment3
bug fixed
commit by 13307130309