Increased visibility of trash can in image uploader for broken url
Increased visibility of trash can in image uploader for broken url

closes #838

- adds a min height value to pre-image-uploader scss

dbalders/Ghost-Admin,kevinansfield/Ghost-Admin,airycanon/Ghost-Admin,JohnONolan/Ghost-Admin,TryGhost/Ghost-Admin,airycanon/Ghost-Admin,acburdine/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,dbalders/Ghost-Admin,acburdine/Ghost-Admin,JohnONolan/Ghost-Admin