Use sRGB color space in TextMate templates

As pointed out in textmate/textmate#768, TextMate does not display hex-colors properly because it uses the "Apple Generic RGB" color space by default.

Support for explicitly defining the color space in themes has been added recently (textmate/textmate@d70ccc7cdf4750eed00672cff77ddf23f4e96251) to TextMate 2 (preview).

See also [Changelog for TextMate a9383](https://github.com/textmate/textmate/blob/master/Applications/TextMate/about/Changes.md#2013-02-18-a9383)