Fixed bug of file uploading

1. Set the image width to 320px and height to 240px of recommended article with slideshow block
2. Set the image width to 110px of article list block with feature image
3. Fixed bug that article can not be updated if its content contain image from feature or gallery
4. Disabled delete media if it is used by published article
5. Deleted the draft asset media if a media is removed
6. Added more media information in media list page, such as ID, image, size
7. Fixed bug that a message box pop up when click yes button if no image is choose or uploaded
8. Fixed bug that the error message implement incorrectly when uploaded a non-allowed file