External api for OMIM from disease page

This is still in a rough state. What it currently does is to get the OMIM title through API for OMIMs linked from the two tables (genes_by_biology and genes_by_orthology).

**To test locally you will need to copy the API key** from ``/home/sgao/wb/website/credentials/omim_apikey.txt ``to your ``credentials/`` directory at the root of ``website/``

A sample disease page: ``resources/disease/DOID:0050432#012--10``