Release 0.8.3

**Species+:**
* choice of csv separator
* EU Legislation page
* fix to randomly appearing French country names
* activity page

**Species+ Admin:**
* documents management for elibrary
* documents search for elibrary
* changes to event management for purposes of the EU Legislation page

**CITES Trade:**
* choice of csv separator

**CITES Trade Admin:**
* fixes to batch update
* fixes to search by taxa with cascading
* automatic resolution of reported -> accepted taxon concept


**Deployment notes**
* `rake db:migrate`
* SQL from #383 
* seeds from #373 
* `rake downloads:cache:clear`