code: function getMetaData (data) {
      if (typeof data !== 'string') {
          throw new MeowError ('data is not a string');
      }
      data = data || '';
      data = data.split('\n');
  
      if (('' + data[0]).trim() !== '<!--') {
          throw new MeowError ("Incorrect format : Missing '<!--' in the beginning of the file");
      }
  
      var index = 1, metaData = [], dataLen = data.length;
  
      while (index < dataLen  && ('' + data[index]).trim() !== '-->' ) {
          metaData.push(data[index]);
          index++;
      }
  
      if (index == dataLen) {
          throw new MeowError ("Incorrect format : Missing closing '-->' for metadata comment");
      }
  
      metaData = metaData.join('\n');
      metaData = yaml.parse(metaData);
  
      if (!metaData.tags || typeof metaData.tags !== 'string')
      {
          metaData.tags = '';
      }
      metaData.tags = metaData.tags.split(',');
      metaData.tags = _.map(metaData.tags, function (tag) { return tag.trim(); });
  
      if (!metaData.keywords || typeof metaData.keywords !== 'string')
      {
          metaData.keywords = '';
      }
      metaData.keywords = metaData.keywords.split(',');
      metaData.keywords = _.map(metaData.keywords, function (tag) { return tag.trim(); });
  
      return metaData;
  }
docs: Retrieves metadata for a given meow format blog post. This metadata will further be cached into 'posts'.
  @param data The meow format blog post; must be a string
  @returns {Object}
  Typical format would be :
  {
  title: (title)
  published-date: (published-date)
  tags: [tagArray]
  }