Revert "回滚之前对设置xib的修改，解决xcode5与xcode4之间xib不兼容的问题"

This reverts commit 46f7081696cc7f73c489dafca5340d2a0c560fd9.
Revert "完善设置输入用户名的界面"

This reverts commit afa725f550b9271923233f9f33099cc79eae5c1e.