Charts on node pages

[Adam K Dean]

We need to add charts onto the node pages.

There needs to be four charts:

• Availability
• Requests
• Data In
• Data Out

With the following time period options:

• Last 24 hours (broken into hours)
• Last week (broken into days)
• Last month (broken into calendar days)

The style should match the current site, using white background, grey for axes etc, and green for series.

Depends on https://github.com/edge/index/issues/147