Dea sends its index instead of its uuid during router.register
Dea passes a Steno logger to VCAP::Component
Add varz attribute for number of available stagers

[#49814623]

* varz["reservable_stagers"]
Add 'available_memory_ratio' metric to varz
Add available disk ratio

Also fix available_memory_ratio implementation

[#49814623]
Bump vcap-common
Bump java buildpack

Alex Suraci and David Sabeti (1):
  kill process on OutOfMemoryError

Ben Hale (5):
  Upgrade Tomcat
  Merge 49892467-tomcat-upgrade to master
  Travis and dependencies updates
  Default JRE version change
  Merge 49892507-java-7-default to master