Bump src/dea_next

Bump cloudfoundry/dea_ng:
  Maria Shaldibina:
     Remove dead code ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/14898445 )
  Ruth Byers:
     allow custom buildpack urls with special characters ( Travis Failed: https://travis-ci.org/cloudfoundry/dea_ng/builds/14839008 )
     fix off by one error in resource availability ( Travis Unknown )
  Alex Jackson:
     bump loggregator emitter gem ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/14835617 )
     update loggregator emitter lib ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/14835065 )
     Make host explicitly bad in failure spec for loggregator emitter ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/14826212 )
     bump to loggregator emitter to version 2.0.1 ( Travis Failed: https://travis-ci.org/cloudfoundry/dea_ng/builds/14819975 )
  Aram Price:
     Resurect .travis.run ( Travis finished: https://travis-ci.org/cloudfoundry/dea_ng/builds/14570068 )
     Normalize .travis.yml ruby declaration ( Travis finished: https://travis-ci.org/cloudfoundry/dea_ng/builds/14560887 )
     Upgrade ruby to 1.9.3-p484 ( Travis finished: https://travis-ci.org/cloudfoundry/dea_ng/builds/14521495 )