Link version attr to github, if displayed. Prepend to button group, as not to distract from brand(?)
Use global constants for the seperators of metrics.

See config/initializers/global_configurations.rb for reasoning.

Apply across metrics controller, and libraries.
Use dynamic step size algorithm

Instead of hardcoding to the buttons on the navbar, dynamically adjust step for
the timeframe in order to generate 600 points.

600 is a good number, because for multiples of 10 minutes, it's exactly
divisible. 10 minutes is the minimum, because that's 600 seconds, and we're
working in seconds since epoch.
Bootstrapify stacked legend

Make it look more in place with the rest of the site theming. Also make it
responsive to the resizing of the graph itself.