Fix `Pods-resources.sh`: add newlines between `install_resource` calls

After #1030 `Pods-resources.sh` fails if more than one resource is present because there are no newlines between `install_resource` calls:

```
install_resource 'MyFile.xib'install_resource 'arrow.png'
```

Error (edited):

```
PhaseScriptExecution "Copy Pods Resources" 
...
rsync -av --exclude '*/.svn/*' .../MyFile.xibinstall_resource .../arrow.png
MyFile.xibinstall_resource" failed: No such file or directory (2)

```