Update rspec version for rspec3 preparation
Convert specs to RSpec 2.99.0 syntax with Transpec

This conversion is done by Transpec 2.2.4 with the following command:
    transpec

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

* 96 conversions
    from: its([:key]) { }
      to: describe '[:key]' do subject { super()[:key] }; it { } end

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

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

* 16 conversions
    from: it { should have(n).error_on(...) }
      to: it 'has n error_on' do expect(subject.error_on(...).size).to eq(n) end

* 13 conversions
    from: describe 'some routing' { }
      to: describe 'some routing', :type => :routing { }

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

* 10 conversions
    from: describe 'some view' { }
      to: describe 'some view', :type => :view { }

* 10 conversions
    from: it { should have(n).items }
      to: it 'has n items' do expect(subject.size).to eq(n) end

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

* 9 conversions
    from: it { should_not have(n).error_on(...) }
      to: it 'does not have n error_on' do expect(subject.error_on(...).size).not_to eq(n) end

* 8 conversions
    from: Klass.any_instance.stub(:message)
      to: allow_any_instance_of(Klass).to receive(:message)

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

* 6 conversions
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

* 3 conversions
    from: be_false
      to: be_falsey

* 2 conversions
    from: Klass.any_instance.should_receive(:message)
      to: expect_any_instance_of(Klass).to receive(:message)

* 2 conversions
    from: be_true
      to: be_truthy

* 2 conversions
    from: describe 'some request' { }
      to: describe 'some request', :type => :request { }

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Fix some warnings
Update rspec
Fix way of errors_on writing
Remove rspec/autorun from spec_helper
Merge pull request #122 from irasally/update-rspec

Update rspec3!

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