Revert 9554983..9a54fac

This rolls back to commit 9554983dc93a60690fe5c6dbe899c777ad1b9874.
-pdf、layout、qrcode crame
--change the tab bar's height -- by weikai

修改了left tabbar的高度，将其在ios7下由56改为49.
--add contains for doclistview's bottom

给右侧底部添加Constants—by weikai
Merge branch 'wk_bugs' into develop