This adds a simple JBrowse displayer for sequence features on report pages.

This uses the additions in 1.3.1 and 1.3.2 to run a report displayer showing a genomic location.

This requires users to add report displayer config to `webconfig.xml`:

```

<reportdisplayer javaClass="org.intermine.bio.web.displayer.JBrowseDisplayer"
    jspName="model/jbrowseDisplayer.jsp"
    replacesFields=""
    placement="Genomics"
    types="SequenceFeature"/>


```

![jbrowse-displayer](https://cloud.githubusercontent.com/assets/436846/2594091/719601d2-ba89-11e3-8f57-1d1a93ab64cd.png)