code: function createGlyph(name, collection, id, colors, fileFormat) {
    var glyph = Object.create(Glyph);
    if (!colors) colors = { 'black': 'rgb(0,0,0)' };
    if (!fileFormat) fileFormat = "{0}-{1}-{2}.svg";
    if (!id) id = name;
    glyph.id = id;
    glyph.name = name;
    glyph.collection = collection;
    glyph.url = svgUrl(glyph.name, glyph.collection);
    glyph.colors = colors;
    glyph.exists = null;
    glyph.fileFormat = fileFormat;
    return glyph;
  }
docs: Creates and returns a Glyph instance