报错：
Xamarin Android 编译时发生以下错误：
libpng warning : iCCP: Not recognizing known sRGB profile that has been edited
解决：
把android项目下的resource下面的png图片，双击打开，简单编辑保存一下，就OK了。
参考：
Here’s a way to resolve the issue within Visual Studio (I'm using VS2015) on a file-by-file basis:
Double-click the offending image file in the Project window to bring up Visual Studio’s image editor window.
Press “P” (shortcut to the “Draw a free-form line” tool).
Select a color from the Properties window that exactly matches an area in your image (e.g. white).
Paint over a few pixels in that area, save, and rebuild. The warning for that file should disappear.
Cheers!
http://forums.xamarin.com/discussion/31167/suppressing-libpng-warning-iccp-not-recognizing-known-srgb-profile-that-has-been-edited
