Bumping version to 3.1.0
Bumping version to 3.1.0

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