edit java-tips.html with java 7 & 8 info & add .erb for variable use
edit java-tips.html with java 7 & 8 info & add .erb for variable use

afeld/docs-buildpacks,cwest/docs-buildpacks,bridgetkromhout/docs-buildpacks,TimGerlach/docs-buildpacks,dantwining/docs-buildpacks,cloudfoundry/docs-buildpacks