Remove format.atom check.

The check was added at
https://github.com/rubygems/rubygems.org/commit/3d0c24e27ada9989a252e998c19d623d1307e1a2#diff-e4663ec6bcde373fc1ee998eb69725b1R3
Commit message says it was added to make clearance happy, however we
dont need that check anymore.
Merge pull request #804 from arthurnn/remove_atom_check

Remove format.atom check.
Update honeybadger to version 1.16.7
Remove some unecessary test setup

clearance/test_unit , should take care of the clearance session setup
capybara/rails , should take care of the capybara app setup
Rename download test to not colide with unit test
Use HTTP_ when setting a header to env

On latest rack versions, you need to setup the headers under env using HTTP_*, this make tests pass under rails 3 and 4
Dont use Rails.env before require rails/all

On rails 4.0+ , when calling Rails.env that will be memoized https://github.com/rails/rails/blob/4-0-stable/railties/lib/rails.rb#L56 , so if RAILS_ENV changes after that, for instance for tests https://github.com/rails/rails/commit/3ff263919c67588e4348da30cb92b860fe83cba5 that @_env ivar will have the wrong value.

Solution is not use Rails.env before requiring all rails
Remove bundler assets group

Rails 4+ dont build an app with assets group anymore, we can remove that right now under rails 3.2 too
s/assert_include/assert_includes to be compatible rails 3 and 4
Merge pull request #808 from arthurnn/remove_assets_group

Remove bundler assets group
Merge pull request #807 from arthurnn/application_rb_change

Dont use Rails.env before require rails/all
Merge pull request #805 from arthurnn/remote_some_test_helper

Remove some unecessary test setup
Merge pull request #806 from arthurnn/sue_http_header

Use HTTP_ when setting a header to env
Merge pull request #809 from arthurnn/assert_includes

s/assert_include/assert_includes to be compatible rails 3 and 4