upgrade to Qt 5.2.1

Signed-off-by: Takashiro <takashiro@qq.com>
support windows x64

Signed-off-by: Takashiro <takashiro@qq.com>
update the translation file

Signed-off-by: Takashiro <takashiro@qq.com>
remove an unused Room object (a new one has been created inside MainWindow)

Signed-off-by: Takashiro <takashiro@qq.com>
Merge pull request #60 from takashiro/master

use Qt 5.2.1 and support Windows x64