Add --cleanup option.

Adds an optional --cleanup option flag to remove the downloaded archive and any unpacked source, as suggested in #116.
Version bump to 0.5.0.
Added the --system option for installing into /usr/local (closes #141).
Added bzip2 as a dependency.
Add JRuby 1.7.14.
Version bump for new versions/md5s.
Remove duplicate `gem install bundler` logic.
Add a comment.
Rubinius requires the static version of LLVM (rubinius/rubinius#3117).

* Fedora keeps libLLVM.a in the llvm-static package.
Add JRuby 1.7.15.
Remove the 2.1 version alias, since it is no longer supported.
Added a version alias for the new ruby 1.9.2 release.

* https://www.ruby-lang.org/en/news/2014/08/19/ruby-1.9.2-p330-released/
Add option not to extract tarball
Formatting.
Add ruby-2.2.0-preview1
Merge pull request #163 from voxxit/patch-1

Add ruby-2.2.0-preview1
Add ruby-2.2.0-preview1
Add Ruby 2.1.3.
Merge branch 'patch-1' of github.com:voxxit/ruby-install into voxxit-patch-1

Conflicts:
	share/ruby-install/ruby/versions.txt
Merge pull request #164 from voxxit/patch-1

Add "2.2" -> "2.2.0-preview1" mapping