Remove LOC displays from coverage graph

[josephsnyder]

To eliminate an error where the Lines Of Code data attempted to access a non-existant yaxis object, remove the plots for LOC from the coverage over time display.

With an update to the design, they may be reintroduced by switching to yaxes in the plot's options object and then reintroducing the data.

Previous State:

Current State:

[williamjallen]

Is there an easy way to re-add the loc(un)tested data to the plot. The code itself looks fine, but I think having the loc data on the plot is valuable information to include.

[josephsnyder]

@williamjallen, @zackgalbreath thought it would be cleaner to have only the one plot and one axis on the page. I was thinking a hover/tooltip like (http://www.flotcharts.org/flot/examples/interacting/) would give us the information we really want without being too confusing.

ETA: Demonstration of Tooltip:

Is that reasonable?

[williamjallen]

@josephsnyder I like that idea. That way, if the coverage drops (or spikes) suddenly you can do a little bit of preliminary exploration to determine the cause.

[williamjallen]

Actually, one request: Can you add labels to the axes? It's not clear what the x-axis is. I think it also might be good to fix the bounds so it always shows a scale from 0 to 100% on the y-axis. As it is now, it looks like Cmake had a drastic drop, when it really only dropped less than 1%.

Here's a screenshot from CMake:

[josephsnyder]

@williamjallen, I don't see a way to pin the axis values to a set number. By adding a step to the x axis label, I think we can clarify that it's supposed to be a build time:

[williamjallen]

@josephsnyder That seems reasonable to me. Perhaps we should also include the date with those timestamps though...