Removes beore(:all) and after(:all) hooks

- to delete clients
- to delete operations
Replace before and let with given and background

- remove pagination examples tone more speedy
Remove shared_db_connection
Update spec to 2.99
Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.4 with the following command:
    transpec

* 46 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

* 41 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 10 conversions
    from: its(:attr) { }
      to: describe '#attr' do subject { super().attr }; it { } end

* 7 conversions
    from: obj.should
      to: expect(obj).to

* 5 conversions
    from: == expected
      to: eq(expected)

* 4 conversions
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

* 3 conversions
    from: =~ /pattern/
      to: match(/pattern/)

* 3 conversions
    from: describe 'some controller' { }
      to: describe 'some controller', :type => :controller { }

* 2 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 1 conversion
    from: be_false
      to: be_falsey

* 1 conversion
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Update spec up to 3.0.1
Merge branch 'rspec_features_back' into update_rails4

Conflicts:
	spec/features/account_operations_spec.rb
	spec/features/admin_pages_spec.rb
	spec/features/authentication_pages_spec.rb
	spec/features/clients_page_spec.rb
	spec/features/operations_page_spec.rb
Remove cucumber-rails

- remove cucumber-rails gem
- remove features folder
Remove require 'rspec/autorun'

To remove the warning “Requiring `rspec/autorun` when running RSpec via
the `rspec` command is deprecated.”
Update capybara to 2.4.1 and ruby to 2.1.0