use ENV['MEMCACHE_SERVERS']
updated Gemfile.lock
Merge branch 'master' of github.com:articlemetrics/lagotto

* 'master' of github.com:articlemetrics/lagotto:
  simplify checks for normalized URL
  adjusted validation of work url. #130
  change api routes for new default param in source, publisher
  updated API documentation for minor changes in v5 API