Create a set of linked schemas for genes

[andrawaag]

To explore how linking schemas in the new ShEx extension works describe a set of interlinked gene shapes. E.g. "non-coding gene" as a subclass of "gene". The "gene" shape would have "zero or more proteins", whereas the "non-coding gene" would be able to specify exactly "zero proteins". But yet it would "inherit" many of the same other properties (like chromosome, start, end, ortholog, etc.)

[andrawaag]

human gene inherits human chromosome and genome build)