Release version 2.3.3

• [#215] Bug fix in API where a BadgeSash would be created without failures
  with a nil badge_id.
• Add validations to BadgesSash
• Rename generated migration files to explicitly name merit
• README improvements

Release version 2.3.2

• [#218] Implement I18n for internationalization support
• Tests with Ruby 2.2. Ignores EOL Rails 4.0.
• Adds CONTRIBUTING document

Release version 2.3.1.

• [#204] Sash creation bugfix on certain conditions
• [733da49] Improve examples and docs for points on option

Release version 2.3.0.

• [#206] Allow Rule to find Badge by badge_id
• [#197] SVG badges in favor of PNG in the readme.
• [#195] migrations refactor
• Tests with Rails 4.2