Gem path problems with bundler clean env, notice the executable dir in `gem env` and that it does not point to ree

bundler_clean_env.rb

# Run from rbenv 1.9.3-p392

require 'open3'
Bundler.with_clean_env do
  stdin, stdout, stderr, wait_thr = Open3.popen3 <<-SH
    eval "$(rbenv init -)" ;
    rbenv shell ree-1.8.7-2012.02 ;
    gem env
  SH

  while !stdout.eof? &&  line = stdout.readline
    puts line
  end
end

output.txt

-> % bundle exec ruby debug.rb                                                                                                              
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.15
  - RUBY VERSION: 1.8.7 (2012-02-08 patchlevel 358) [i686-darwin12.2.0]
  - INSTALLATION DIRECTORY: /Users/trobrock/Sites/tensai/vendor/ruby/1.9.1
  - RUBY EXECUTABLE: /usr/local/opt/rbenv/versions/ree-1.8.7-2012.02/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/trobrock/Sites/tensai/vendor/ruby/1.9.1/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-darwin-12
  - GEM PATHS:
     - /Users/trobrock/Sites/tensai/vendor/ruby/1.9.1
     - /Users/trobrock/.gem/ruby/1.8
     - /usr/local/opt/rbenv/versions/ree-1.8.7-2012.02/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

@danryan and @Peeja this is the current issue with running Tensai locally for me.