Some refactoring.
Explicitly require 'yui/compressor' in app.rb.
Clean up more DOI errors.
Detect fulltext availability.
Reintroduce option to process records in batches.
Use beanstalkd to queue harvesting jobs.

Currently hardcoded to use beanstalkd on localhost only.
Merge branch 'feature/queue-fetching' into develop
Add license agreement.