ALM-686 enable memcached cluster
ALM-686 adapted configuration
ALM-686 only manage workers if workers are specified in settings.yml
ALM-686 can't use rails variable in capistrano
ALM-686 provide number of workers as ENV variable
ALM-686 use ENV for workers
ALM-686 ENV is of type string
removed outdated code
fixed syntax error
ALM-686 allow to pass memcached_servers as ENV
ALM-625 import via CrossRef API
ALM-686 only monitor workers if workers are set in settings.yml
added proper version number
set delayed_job workers in capistrano config
fixed links to source pages
ALM-685 better handle not found errors
ALM-685 remove unused spec
ALM-685 handle not found errors in concerns
ALM-686 tweak tests
ALM-625 adapt cucumber tests for import