bundler/bundler — pull request #2616 by sanemat (2013-08-30 08:56:12+00:00)
Title: Require version file for checking capistrano version

bundler-1.4.0.pre.1 works fine, but bundler-1.4.0.pre.2 shows error below:
```
$ bundle exec cap production deploy
/path/to/bundler-1.4.0.pre.2/lib/bundler/capistrano.rb:7:in `': uninitialized constant Capistrano::Version (NameError)
```

This commit brings this error, so I add require version file.
1d7a7893dfeb85afa25a3a526354b31c85f05dbf

bundler: 1.4.0.pre.2
capistrano: 2.14.2