[openstreetmap-website] Make iD default editor (#453)

[John Firebaugh]

This makes iD the default editor on OSM. It's already the first option in the drop down, but this PR makes iD the editor that users land in when they just click the "Edit" label.

I hope to get this merged, now that [initial concerns](https://github.com/openstreetmap/openstreetmap-website/pull/262)
were addressed with the 1.1. release of iD [that was just rolled out on OpenStreetMap.org](https://github.com/openstreetmap/openstreetmap-website/pull/424):

- Improved performance
- Added relation support
You can merge this Pull Request by running:

  git pull https://github.com/osmlab/openstreetmap-website id-default

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/453

-- Commit Summary --

  * Make iD default editor

-- File Changes --

    M app/controllers/application_controller.rb (18)
    M app/controllers/site_controller.rb (2)
    M app/helpers/application_helper.rb (10)
    M config/example.application.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/453.patch
https://github.com/openstreetmap/openstreetmap-website/pull/453.diff

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