code: function(c, startLine, startCol) {
          var reader  = this._reader,
              comparison  = c + reader.read(),
              tt      = Tokens.type(comparison) || Tokens.CHAR;
  
          return this.createToken(tt, comparison, startLine, startCol);
      }
docs: Produces a comparison token based on the given character
  and location in the stream. The next character must be
  read and is already known to be an equals sign.
  @param {String} c The character for the token.
  @param {int} startLine The beginning line for the character.
  @param {int} startCol The beginning column for the character.
  @return {Object} A token object.
  @method comparisonToken