gaugeColor, like other color options, is now bound as a local scope property rather than a bi-directional binding that previously required a quoted value like gauge-color="'#ff0000'".
Ensure that gauge-color="'#ff0000'" still works by removing single quotes for backwards compatibility. Otherwise the invalid color '#ff0000' including quotes would render as black rather than red.
Merge pull request #2 from idpaterson/pull-requests/gauge-color-fix

Fixes gauge-color attribute to parse as documented