Merge pull request #161 from lwanghaol/ios-style

wanghao:fix bug issue-36,when adding a widget fails, you can not long click
fix bug:issue-37, the wallpaper thumbnail loading image is out of shape.

replace the wallpaper thumbnail loading image.
Merge pull request #164 from whuthm/ios-style

fix bug:issue-37, the wallpaper thumbnail loading image is out of shape.
Merge pull request #165 from lwanghaol/ios-style

wanghao:fix bug issue-38,without prompting when download apk that no SD card
Merge pull request #54 from heyongjian/ios-style

merge pull request