Merge branch 'hotfix/1.25.25'
Tidy up the list of MRI rubies we support
Use new githubusercontent.com URLs for the patchsets
Use new githubusercontent.com URL for installing brew
Use new githubusercontent.com URL for getting MagLev's version
Add description on how to troubleshoot
Merge pull request #2830 from ingemar/patch-1

Add description on how to troubleshoot
Friendlier message when we fail to cleanup files
Remove verbose flag for compatibility with OpenBSD
Allow Ruby to be compiled statically but use dynamic extensions
Merge pull request #2836 from justinlocsei/dynamic_extensions

Allow Ruby to be compiled statically but use dynamic extensions
Add MD5 hashes for MRI Ruby 2.1.2.
Merge pull request #2839 from CodeGnome/pull-reqs/add_md5_hashes_for_ruby-2.1.2

Add MD5 hashes for MRI Ruby 2.1.2.
Add MRI Ruby 2.1.2 to list of known rubies.

- Make new MRI Ruby 2.1.2 visible in the list of known rubies.
- Make MRI Ruby 2.1.2 the default when installing the Ruby 2.1 series.
- Demote MRI Ruby 2.1.1 to a known legacy version.
Remove unused patch levels from semantic versions.

- Starting with Ruby 2.1.0, Ruby now uses semantic versioning instead of
  patch levels.
- https://www.ruby-lang.org/en/news/2013/12/21/semantic-versioning-after-2-1-0/
  has details.
Add MRI Ruby 2.1.2 to list of known strings.
Remove 2.1.1 from known_strings.

Ensure that only the latest 2.1 version is listed in
config/known_strings.
Merge pull request #2840 from CodeGnome/pull-reqs/add_ruby-2.1.2_to_known_rubies_list

Add Ruby 2.1.2 to list of known rubies.
added rails express patches for ruby-2.1.2
Merge pull request #2844 from skaes/railsexpress-2.1.2-patches

added rails express patches for ruby-2.1.2