don't detect colors in metadata

[theflow]

  it("should parse metadata without detecting colors", () => {
    var test = `
group:
  oct/:
    backgroundColor: #EEEEEE
`;
    var tree = parser.parse(test);
  });

Parse error on line NaN: Unexpected '#'

I don't think it should detect a color here, just treat it as a string

[halfbyte]

Quite the contrary: The bug is that the color is not correctly parsed. We need colors (and references!) as meta values. I'll take a look.

[halfbyte]

Colors are now parsed, as well as references.