An alleged photo of a space gray second-generation iPad mini shell was posted on a French site. Though this is the first time the color has been seen on an iPad, it’s certainly not a surprise, considering Apple is using space gray in its iPhone 5s and iPod touch, nano, and shuffle. It also wouldn’t be a surprise to see the color make its way to the fifth-generation iPad. But it remains to be seen if the gold color seen in the iPhone 5s…