Moved my projects to Unity 5, now all my sprites are set to "Tight" mesh generation instead of "Full Rect". Easy way to automagically set it all back?

Unity Sprite Mesh Tight To Full Rect - Album on Imgur [1]

As you can see, unity is now generating all sorts of vertices and faces that I don’t need in my game. I have lots and lots of spritesheets imported and need to change them all from texture type “Sprite” to “Advanced” and set the mesh type to Full Rect.
Simply doing a mass selection doens’t work because it messes with some other import settings.
Any good way to do this with code? Or some hidden setting?
Thanks for your help in advance.

I used notepad++ to replace all the SpriteMeshType: 1 to SpriteMeshType: 0 in the .meta files

here is an image of my notepad++ setup