[openstreetmap/openstreetmap-website] Use an authorisation framework (#1626)

[Andy Allan]

For reference I [made a start](https://github.com/gravitystorm/openstreetmap-website/tree/cancancan) on integrating CanCanCan a few weeks ago, and the proof of concept worked (just allowing sign in and viewing the /welcome page). 

What became quickly apparent is that the whole thing will be much easier to implement if we refactor the majority of the routes first, to use resourceful routing much more widely, so that's what I'm working towards.

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