Added styles for error messages
Added comment about purpose for instructions.css
1.Added Error handling code for Internal Server (5XX) errors.
2.Added second color scale as a start to displaying multiple organisms.
3.Added code to display organisms other than "Human" with a different colorscale.  In the future, we can consider separate color scales for major organism.  Right now, since we have far more Human data, we will only distinquish between Human and Other.
4.Unmatched phenotypes are displayed with Phenotype name (not just ID)
Merge branch 'master' of https://github.com/monarch-initiative/monarch-app