Encourage users to install the ruby-full meta-package.

* This will also install ruby-dev, which is needed for compiling any C
  extensions.
Emphasis installing ruby from the package manager.

* Most users just need a Ruby so they can run sass or jekyll.
  Whereas RVM/rbenv are more suited for developers and power-users.
Organize in-page links by installation method than by platform/tool.

* Combined the Package Management Systems sub-list into the top list.
Split the "Third party tools" section into "Installers" and "Managers".
Added ruby-build and ruby-install to the Installers section.
Added chruby to the Managers section.
Put Installers before Managers.
Add a summary to the Installers section.
Link to the chruby section.
Translate (fr) the CFP Tropical Ruby 2015 news.
Fix paragraphs (es)
translate changed default settings of ext/openssl (id)
Fix heading levels in old post
Use br element for line breaks

Replace markdown syntax (2 spaces) with br elements
to avoid confusion with superfluous trailing whitespace.
Remove trailing whitespace
Fix leading whitespace
Fix syntax highlighting in old post
Fix broken inline code in old post
Fix code examples in old post
Merge pull request #892 from kuntoaji/id-default-settings-ext-openssl

translate changed default settings of ext/openssl (id)