add bundler binstubs to the .profile.d path
store the rails 4 asset cache to improve asset pipeline performance
Move logic to testable class
Merge pull request #147 from hone/cache_assets

store the rails 4 asset cache to improve asset pipeline performance
restrict build rubies to mri 1.9.2 and 1.8.7
update changelog
Merge pull request #143 from heroku/add_binstubs_to_path

add bundler binstubs to the .profile.d path
v80
Merge branch 'master' of git://github.com/heroku/heroku-buildpack-ruby
Merge branch 'master' into production

* master:
  v80
  update changelog
  restrict build rubies to mri 1.9.2 and 1.8.7
  Move logic to testable class
  store the rails 4 asset cache to improve asset pipeline performance
  add bundler binstubs to the .profile.d path