Improve check for openssl on macOS

Add rbx-3.81 and rbx-3.82

Add definition for JRuby 9.1.11.0 and 9.1.12.0

http://jruby.org/2017/06/15/jruby-9-1-12-0.html

http://jruby.org/2017/06/14/jruby-9-1-11-0.html

Added gitignore for bats repository

invoke make update-gems before make install with ruby-trunk

- Only call `openssl version` once;

- Make the check work with future version of LibreSSL after 2.2.7. This
  assumes that Apple might keep updating LibreSSL shipping with macOS,
  but that they will never provide header files.

To use standard_build and standard_install_with_bundled_gems for ruby versions that has bundled gems

  * standard_build invoke configure and make. It not invoke `make install`.
  * standard_install invoke only `make install`.
  * Added backword compatibility function for above separation.
  * Added new function for bundled_gems support named standard_install_with_bundled_gems.

Add rbx-3.76, rbx-3.77, rbx-3.78, rbx-3.79 and rbx-3.80

Ignore LibreSSL bundled with macOS 10.13

Add JRuby 1.7.27

Upgrade to OpenSSL 1.0.2l and 1.1.0f

Add definition for JRuby 9.1.10.0

http://jruby.org/2017/05/25/jruby-9-1-10-0.html

Add jruby-9.1.9.0

Add rbx 3.73, 3.74 and 3.75

ruby-build 20170405

Add JRuby 9.1.9.0 snapshot

ruby-build 20170322