Use pry-byebug in MRI 2.0 and 2.1
Sharpen-up some d3.js-based charts
Also sharpen dashboard bar charts
Update Capistrano to version 3

* Changed db2local so that the task is run by Rake on the remote server,
  and the file then downloaded and imported. This removes the need to
  read the remote DB config.

* Removed "maintenance" recipe in favour of the separate Cap library.

* Removed "unicorn" recipe in favour of the separate Cap library.