Add axis labels to cumulative views graph

[rcave]

The X and Y axis of the cumulative views graph need labels to make it intuitive at first glance. The Y-axis should be labeled "Views" and the X-axis labeled "Months". See attached mockup.

[rcave]

Old mockup of article usage graphs

[rcave]

Please review with Pete before commit.

[josowski]

Dojo does not support labeling of Axis note. I've added HTML though and with some CSS we should be able to position labels correctly. The HTML when rendered will look like this:

<div id="cumulativeGraphYLabel">Views</div> <div id="cumulativeGraph"></div> <div id="cumulativeGraphXLabel">Months</div>

[stoomey]

(In [7806]) Added CSS to correctly position cumulative graph axis labels. I also found and closed an open html <p> tag in the article rhc ftls. Fixes #1371