Add enhance visual styles of failed assertions

[rupl]

During discussion of #86 we mentioned a toggle for the visual style of failed assertions. The idea is that it might be useful to have a very stark contrast on failed tests, but also be too vivid if someone is closely reading stats.

I thought of a couple possibilities:

• A toggle button to turn off "bright mode"
• Experiment with color palettes that are more complementary. So the colors have lots of contrast but aren't as harsh. (maybe a washed out orange to compliment the current pallette?)
• A way to differentiate between a test that is currently failing versus a test that has failures in its history. "Important now" vs "things to look out for"

[davidlinse]

What about using red for important now and yellow for things to look out for ?

[stefanjudis]

Hmm... I'm updating the current output to gh-pages right now. Would be nice if you could give feedback about visualisation ( and colors ) and let's discuss afterwards.

But to be honest, I don't want to have too much colors in there. Like the style pretty much as it is... :blush: Red was already tough for me...

But let's discuss. :)

[rupl]

I'm happy to get this up and running in a branch. I was already starting to work on one :grin: I agree that putting too many colors will make it unreadable. But I'm confident we can find a way to show some of these options without cluttering the interface too bad.