Fixes breakage caused by curl arguments change in
d0912e4f

Fix Rubinius gem binstubs path

`tar` on OS X auto-detects the type of compression used, so it doesn't
care whether `-z` or `-j` flags were passed to it for extraction.
However, since latest Rubinius archives are compressed with bzip2, we
must handle this distinction explicitly for the sake of other platforms.

fixes #470

Added a definition for JRuby 1.7.6.

Add rbx-2.1.1

Rubinius 2 insists that it installs RubyGems binstubs into
`PREFIX/gems/bin` instead of `PREFIX/bin`.

This creates complexity for rbenv rehash and exec processes, so we
symlink `gems/bin` into `bin` and have RubyGems create binstubs at a
location that is consistent with other Ruby implementations.

See sstephenson/rbenv#178, sstephenson/rbenv#461

Add Rubinius 2.1.0

Add JRuby 1.7.5

Run bundle before configure rubinius

Fix a typo in the README file.

Add description of `RUBY_CFLAGS` to README.

Manually reverted using mirror site. and use http protocols

Wrap at 80 characters.

[WIP] use www.dnsbalance.ring.gr.jp

Don't set the Rubinius gems directory to the prefix

This causes tricky issues with Bundler. Bundler assumes that the
configure gem path *only* contains gems. When using this configuration
option, this is not the case.

What happens is that Bundler then removes the path for the Ruby stdlib
from the load path, because it is located inside what is configured as
the gems directory. This then breaks for example Rails applications when
using ruby-build to build Rubinius.

Also see: https://github.com/rubinius/rubinius/issues/2544

Homebrew homepage location changed

Change server protocol of the ruby-lang.org server in the MRI definitions from HTTP to FTP