Development Pod can not retrieve `resource_bundles`

Hi thanks for the awesome work,

I have successfully adapt the cache for third party frame work and development pod without assets folder and xib file

When it come to development pod pod which has `assets` folder and `xib` file. I can not use `spec.resources` as it will be duplicate after prebuild (See attachment image). i can only use `resource_bundles`

```
spec.resource_bundles = {
"#{spec.name}" => [
"#{spec.name}/**/*.{lproj,xcdatamodeld,xib,json,ttf,xcassets}",
],
}
```

with above spec i can see assets folder and xib files are copied into development pod
The problem is i can not invoke get my image and nib with normal way

for xib
```
super.init(nibName: "SplashViewController",
bundle: Bundle(for: SplashViewController.self))
```

and image
```
UIImage(named: name, in: Bundle(for: aClass), compatibleWith: nil)
```

the 2 above normal method will not work anymore. Any suggestion that we can use cache for development pod with assets and xib?