Latest commit 87fc615 May 21, 2016 @philr philr Improvements to the reporting of invalid identifiers.
- Include the identifier in all error cases in
  ZoneinfoDataSource#load_timezone_info.
- Include the country code in InvalidCountryCode messages raised in
  ZoneinfoDataSource#load_country_info (this was already being done in
  the RubyDatasSource equivalent).
- Minor changes to the format of the exception messages.
- Add additional test cases.
- Make tests match on word boundaries to avoid matching filenames, etc
  that may also be included in the message.