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Creates an Examiner which scans the given +source+ for code smells.

@param source [File, IO, String]
  If +source+ is a String it is assumed to be Ruby source code;
  if it is a File or IO, it is opened and Ruby source code is read from it;

@param filter_by_smells [Array<String>]
  List of smell types to filter by, e.g. "DuplicateMethodCall".

@param configuration [Configuration::AppConfiguration]
  The configuration for this Examiner.

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