ruby-install 0.4.2

### 0.4.2 / 2014-04-17

#### ruby

* Call `autoreconf` if `configure.in` was patched but `configure` was not.

#### jruby

* Added version 1.7.12.

#### rbx

* Added version 2.2.6.
* Install bundler into `vendor/gems/` to prevent issues when the default
  gemdir is not writable or does not yet exist.