Merge pull request #6 from Harry-Chen/master

在关于菜单中添加“开发者”项
fix build error
fix code format
Activities: Add AbsActivity as a base class of Activity
DevelopersActivity: fix crash due to uid error
gitignore: ignore lint.xml
在开发者列表下部增加感谢名单(初步，非常丑，有待画一个布局)
将字符串中的"..."换成"……"

Signed-off-by: Harry Chen <373685963@qq.com>
丧心病狂地修正了一大堆警告
基本都是多余的import（增加AbsActivity导致）和AsyncTask要用可变参数你用了数组

Signed-off-by: Harry Chen <373685963@qq.com>
不好意思我给把配置再你改回来...

Signed-off-by: Harry Chen <373685963@qq.com>