Embed BLAST search

A mine that has this is [PlanMine](http://planmine.mpi-cbg.de/planmine/begin.do), and others are interested in having this in Bluegenes as well.

Mine admins would start their own [SequenceServer](https://github.com/wurmlab/sequenceserver) whose address they'll specify in Bluegenes' config. When this is configured, a BLAST search should appear on the Bluegenes home page, which when run sends you to a results page ([API docs](https://github.com/wurmlab/sequenceserver/blob/gh-pages2.0/doc/api.md) for HTTP requests) to show the HTML response (could also show in a modal?).

In addition, on all report pages that have FASTA, there should also be added a button to do a BLAST search with their sequence ([example](http://planmine.mpi-cbg.de/planmine/report.do?id=78436248&trail=%7C78436248)). (If the search results are shown in a modal, this would work well here.)

Start with the Bluegenes configuration, home page, and report pages that expose FASTA, then read the linked SequenceServer API documentation. Define how a configured SequenceServer address launches searches and displays HTML results, including searches from report-page sequences. Done means both entry points work when configured and remain absent or safe when no server is configured.

Written by the indexing model from the issue text.