Removed `expandSingleSource()` option from the `SourceArgumentsResolver`, it's no good after all.
Minor code change because `getCompilerOutDir()` is now named `getCompilerOutputRepo()`
Changed type of options dealing with files to `File` instead of `String`.
Made some option names less confusing.
Adjusted code now that we changed names and types of some elements of `Options`
Minor code changes because of the changes made to `Options`
Fixed JS resource creation