Bump src/dea_next:

Alex Suraci and Onsi Fakhouri (1):
      Only BORN/STARTING/RUNNING/STOPPING tasks consume memory.     Only BORN/STARTING/RUNNING/STOPPING/CRASHED tasks consume disk space.

Alex Suraci and Tim Labeeuw (1):
      remove tests for logging of instance registry

Maria Shaldibina and Zach Robinson (3):
      Test that dea uploads the new cached files
      Move files instead of copying in buildpack test
      Pass environment variables from cf to buildpack [finishes #50074603]

Sarah Chandler and Tim Labeeuw (1):
      Added the latest ruby, and 1.9.3-492 to the travis.yml, removed erlang