Upgrade jdk8 to 8u51
Upgrade jdk8 to 8u51

pwalczak/testagapw,heroku/heroku-buildpack-jvm-common,heroku/heroku-buildpack-jvm-common,Scalingo/jvm-common-buildpack,jcf/heroku-buildpack-jvm-common,jcf/heroku-buildpack-jvm-common,Scalingo/jvm-common-buildpack,pwalczak/testagapw