[close #247] bundle platform with user env args
setup GEM_PATH so rubygems can find bundler
remove bundler setup since it affects BundlerWrapper tests
don't overwrite travis's PATH

the PATH matters b/c the binstubs pick up the ruby based on the ruby in
the path: `#!/usr/bin/env ruby`.
git add . is weird on travis
preserve RUBYOPT except for BundlerWrapper tests
Merge pull request #254 from heroku/schneems/fix-platform-env-arg

[close #247] bundle platform with user env args
remove debug test output
fix ruby patchlevel support
Merge pull request #268 from heroku/schneems/patchlevel

Fix patchlevel support
bump to v118
changelog
Merge remote-tracking branch 'heroku/master' into merge-heroku

* heroku/master:
  changelog
  bump to v118
  fix ruby patchlevel support
  remove debug test output
  preserve RUBYOPT except for BundlerWrapper tests
  git add . is weird on travis
  don't overwrite travis's PATH
  remove bundler setup since it affects BundlerWrapper tests
  setup GEM_PATH so rubygems can find bundler
  [close #247] bundle platform with user env args

Conflicts:
	lib/language_pack/version.rb