Top-level dashboard should show app name as well as path in the legend

[nigeldeakin]

(This issue assumes that PR #38 has been merged)

The graphs shown on the main dashboard label each line by the name of the path. This means that if two apps contain routes with the same path then you cannot tell which line is which.

See screenshot:

The legend should be changed to display appname as well as path. (The only reason this hasn't been done already is to save real estate on the display, which is the main issue to consider when implementing this change)