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Signin must be is tracked when signing with SessionsController#create
and *must not* be tracked when making token-authenticated request.

See #51
Move Devise requirement to application.rb

That avoids the "uninitialized constant Devise::SessionsController" error.
Fix Devise trackable integration

Devise counters sign_in_count, last_sign_in_at, current_sign_in_at
are no longer updated when authenticating with token. They however
keep being updated when signin in through `SessionsController#create`.

See https://github.com/plataformatec/devise/issues/953
and https://github.com/plataformatec/devise/blob/v3.2/lib/devise/hooks/trackable.rb#L6

Fixes #51
Minor reword feature for clarity
Update doc/features.html
Minor fix typo in README

See #50
Merge branch 'fix-sign-in-count-increased-on-each-authenticated-request'
Bump version number