v1.7.0

• Rewrite buildpack using libbuildpack
  behavioural changes:

  • ensure supply does not change build dir
  • gems are available when the buildpack is not last in order
    (https://www.pivotaltracker.com/story/show/149435225)

• Add ruby 2.4.2, 2.3.5, 2.2.8. Remove 2.4.0, 2.3.3, 2.2.6
  (https://www.pivotaltracker.com/story/show/151087653)

• Add yarn 1.0.2, remove yarn 0.27.5
  (https://www.pivotaltracker.com/story/show/151059801)
  (https://www.pivotaltracker.com/story/show/150886385)
  (https://www.pivotaltracker.com/story/show/150856905)
  (https://www.pivotaltracker.com/story/show/150856905)

• Update rubygems if older than version in manifest
  (https://www.pivotaltracker.com/story/show/150884901)

• Add jruby 9.1.13.0, Remove jruby 9.1.12.0
  (https://www.pivotaltracker.com/story/show/150863849)

• Add node 6.11.3, remove node 6.11.2
  (https://www.pivotaltracker.com/story/show/150824934)

• Update openjdk from 1.8.0_141 -> 1.8.0_144
  (https://www.pivotaltracker.com/story/show/150621073)

• Add bundler 1.15.4, remove bundler 1.15.3
  (https://www.pivotaltracker.com/story/show/150383252)
  Packaged binaries:

name	version	cf_stacks
bundler	1.15.4	cflinuxfs2
jruby	ruby-1.9.3-jruby-1.7.26	cflinuxfs2
jruby	ruby-2.0.0-jruby-1.7.26	cflinuxfs2
jruby	ruby-2.3.3-jruby-9.1.13.0	cflinuxfs2
node	4.8.4	cflinuxfs2
node	6.11.3	cflinuxfs2
openjdk1.8-latest	1.8.0	cflinuxfs2
ruby	2.1.8	cflinuxfs2
ruby	2.1.9	cflinuxfs2
ruby	2.2.7	cflinuxfs2
ruby	2.2.8	cflinuxfs2
ruby	2.3.4	cflinuxfs2
ruby	2.3.5	cflinuxfs2
ruby	2.4.1	cflinuxfs2
ruby	2.4.2	cflinuxfs2
rubygems	2.6.13	cflinuxfs2
yarn	1.0.2	cflinuxfs2

Default binary versions:

name	version
ruby	2.4.2

• Uncached buildpack SHA256: 314c24d0712808f2248dbc04d1df3ec9138328a3f723e313a85150fb491e5ef8