Log Message:
Update ruby-bundler to 1.2.0.

## 1.2.0 (Aug 30, 2012)

Bugfixes:

  - raise original error message from LoadError's

Documentation:

  - `platform` man pages

## 1.2.0.rc.2 (Aug 8, 2012)

Bugfixes:

  - `clean` doesn't remove gems that are included in the lockfile

## 1.2.0.rc (Jul 17, 2012)

Features:

  - `check` now has a `--dry-run` option (@svenfuchs, #1811)
  - loosen ruby directive for engines
  - prune git/path directories inside vendor/cache (@josevalim, #1988)
  - update vendored thor to 0.15.2 (@sferik)
  - add .txt to LICENSE (@postmodern, #2001)
  - add `config disable_local_branch_check` (@josevalim, #1985)
  - fall back on the full index when experiencing syck errors (#1419)
  - handle syntax errors in Ruby gemspecs (#1974)

Bugfixes:

  - fix `pack`/`cache` with `--all` (@josevalim, #1989)
  - don't display warning message when `cache_all` is set
  - check for `nil` PATH (#2006)
  - Always try to keep original GEM_PATH (@drogus, #1920)

## 1.2.0.pre.1 (May 27, 2012)

Features:

  - Git gems import submodules of submodules recursively (@nwwatson, #1935)

Bugfixes:

  - Exit from `check` with a non-zero status when frozen with no lock
  - Use `latest_release` in Capistrano and Vlad integration (#1264)
  - Work around a Ruby 1.9.3p194 bug in Psych when config files are empty

Documentation:

  - Add instructions for local git repos to the `config` manpage
  - Update the `Gemfile` manpage to include ruby versions (@stevenh512)
  - When OpenSSL is missing, provide instructions for fixing (#1776 etc.)
  - Unknown exceptions now link to ISSUES for help instead of a new ticket
  - Correct inline help for `clean --force` (@dougbarth, #1911)

## 1.2.0.pre (May 4, 2012)

Features:

  - bundle package now accepts --all to package git and path dependencies
  - bundle config now accepts --local, --global and --delete options
  - It is possible to override a git repository via configuration.
    For instance, if you have a git dependency on rack, you can force
    it to use a local repo with `bundle config local.rack ~/path/to/rack`
  - Cache gemspec loads for performance (@dekellum, #1635)
  - add --full-index flag to `bundle update` (@fluxx, #1829)
  - add --quiet flag to `bundle update` (@nashby, #1654)
  - Add Bundler::GemHelper.gemspec (@knu, #1637)
  - Graceful handling of Gemfile syntax errors (@koraktor, #1661)
  - `bundle platform` command
  - add ruby to DSL, to specify version of ruby
  - error out if the ruby version doesn't match

Performance:

  - bundle exec shouldn't run Bundler.setup just setting the right rubyopts \ 
options is enough (@spastorino, #1598)

Bugfixes:

  - Avoid passing RUBYOPT changes in with_clean_env block (@eric1234, #1604)
  - Use the same ruby to run subprocesses as is running rake (@brixen)

Documentation:

  - Add :github documentation in DSL (@zofrex, #1848, #1851, #1852)
  - Add docs for the --no-cache option (@fluxx, #1796)
  - Add basic documentation for bin_path and bundle_path (@radar)
  - Add documentation for the run method in Bundler::Installer

## 1.1.5 (Jul 17, 2012)

Features:

  - Special case `ruby` directive from 1.2.0, so you can install Gemfiles that use it