[MODEL] Added, that exception is raised when `type` is not passed to Mappings#new
[MODEL] Added information about converting the results to Array with `to_a`

Closes #94
[MODEL] Allow passing an ActiveRecord scope to the `import` method

    Article.import scope: 'published'

Related: #104
[MODEL] Added an integration test for the ActiveRecord scope support for import

Related: #104
[RAILS] Allow passing an ActiveRecord scope to the importing Rake task

    $ bundle exec rake environment elasticsearch:import:model CLASS='Article' SCOPE='published'

Closes #104
[MODEL] Use `__send__`, not `send` in ActiveRecord's `__find_in_batches`

Fixes 9b0e0d0
[MODEL] Added, that `each_with_hit` and `map_with_hit` in `Elasticsearch::Model::Response::Records` call `to_a`

The `zip` method in `records.rb` didn't call `to_a` on the collection,
thus the records were not returned in the same order as Elasticsearch's results.

Related #99
Related #102
[MODEL] Added tests for `each_with_hit` and `map_with_hit`

These are tests for commit 83831b3.

Closes #99
Closes #102