Some bug fixes for the CSV export.

- Checks and creates the folder in data for the csv exports if there isn’t one.
- The exports are now put in environment dependant folders; so for instance any exports ran on development mode won’t be served in production mode.
- Dropped the exception handling
Cronolog and rotate log parameters are back to biocat_local.
Cronolog and rotate log parameters split between biocat_local and environments.production.rb. Yet again.
Yet anothr tweak of rotate logs params.
Yet anothr tweak of rotate logs params.
Yet another tweak of rotate logs params. Again.
Added config/environments/production.rb.pre and ignoring config/environments/production.rb which now has to be configured for each Catalogue installation.
Fixed missing directory error.

In the Curation View, we check to see if there are any recent CSV exports before displaying the link to download them. If the directory doesn’t exist then it throws an error, so we  might as well create the directory if it doesn’t exist
Merge branch 'biocat-master' into biovel-master