修正了退出程序的BUG

用INT代替BOOL标记，修正了快速点击返回键一直播放退出动画的BUG，跳转页面后标记未重置的问题。
change the string to the resource in the user center and the feedback
check the key before bind
if the username or the password is incorrect, will return
Merge pull request #15 from kaxi4it/master

已确认及代码验证，修正了退出程序时的问题。谢谢您，太厉害了，这样的问题都能发现
Merge pull request #19 from kris1987/dev-kris

把 user center里面和feedback里面的一些字符串硬编码写到了string.xml中
Merge pull request #20 from kris1987/dev-kris-check-key

在点击bind之前会检查用户输入的key
Merge pull request #21 from kris1987/dev-kris-check-username

if the username or the password is empty, will return
Merge pull request #1 from eoecn/master

update eoecn