Bumping version to 3.1.1
Bumping version to 3.1.1

jpipard/DKImagePickerController,gorjuspixels/DKImagePickerController,metasmile/DKImagePickerController,North-American-Signs/DKImagePickerController,North-American-Signs/DKImagePickerController,gorjuspixels/DKImagePickerController,jpipard/DKImagePickerController,zhangao0086/DKImagePickerController,zhangao0086/DKImagePickerController,metasmile/DKImagePickerController