Bump java and ruby buildpacks

ruby buildpack git shortlog 4d4ea63..a754b32

Jennifer Hickey and Maria Shaldybina (1):
  Use staging environment for ruby buildpack

java buildpack git shortlog 7459950..294198b

Jennifer Hickey (1):
  Add Play 2.0 Support

Change-Id: I67ca8f9686861f71bfdf9ed7c6ac4e933f772e4e