Stubbed out VCF

Looking for comments
ah, i saw the comment below. so the compose function is requiring that the supplier type match the first type in the function - in your compose2 you are using `MetaInformation` and `VCFReader`. `VCFReader` isn't a super class of `MetaInformation`, so thats probably where the compile error is coming from. 

the calling code needs some more transformations to get everything in the right state