Bump dea_next

shortlog:
Dmitriy Kalinin (1):
      first stab at README on how to run dea_ng with vagrant in isolation

Maria Shaldibina and Nate Clark (1):
      Bump ruby buildpack

Max Brunsfeld and Scott Calvert (4):
      Specify ruby patch level in travis config
      Fix buildpack spec
      Put back rails-specific database config code
      Bump java buildpack

Max Brunsfeld, Ryan Spore and Scott Calvert (1):
      Bump java buildpack