[openstreetmap-website] Refactor user creation actions (#405)

[John Firebaugh]

Create a separate #create action that handles POSTs to
/user/new. This simplifies the other actions and ensures that the URL is
/user/new when validation errors occur, rather than /user/terms.

Fixes #398
You can merge this Pull Request by running:

  git pull https://github.com/osmlab/openstreetmap-website user-new

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

  https://github.com/openstreetmap/openstreetmap-website/pull/405

-- Commit Summary --

  * Refactor user creation actions

-- File Changes --

    M app/controllers/user_controller.rb (108)
    M app/views/user/new.html.erb (2)
    M config/routes.rb (3)
    M test/functional/user_controller_test.rb (26)
    M test/integration/user_creation_test.rb (34)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/405.patch
https://github.com/openstreetmap/openstreetmap-website/pull/405.diff

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