Create async wiring for the various restful interactions

[pasted]

Wire up the RESTful calls for HGNC, Biomart and Cellbase (in that order of returned data). Allow for retries and graceful degradation if no reply.

[pasted]

Split these into a parallel stream for each gene symbol - with the current model the ruleset can also be applied on a gene by gene basis since we're not looking for digenic disorders.