Highlight color should be an option

[OmarShehata]

First I wanted to say thank you very much for creating this! I whole-heartedly agree that comments often miss context and I really like the non-intrusive way you've implemented this.

A small suggestion: I'm using highlight on an article I'm putting together, but my text is white, so when it highlights the text disappears. I got around that by adding my own CSS snippet:

.disqussion-highlighted {
	background: black;
}

Being able to pass a highlight color as an option would be nice!