move mutex files under src/lib
Merge pull request #126 from iHiroakiKawai/queue_thread_safe2

move mutex files under src/lib
Update bundled gems.
Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec -f

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

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

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

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

* 137 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 86 conversions
    from: mock('something')
      to: double('something')

* 40 conversions
    from: be_false
      to: be_falsey

* 27 conversions
    from: obj.stub!(:message)
      to: allow(obj).to receive(:message)

* 26 conversions
    from: collection.should have(n).items
      to: expect(collection.size).to eq(n)

* 20 conversions
    from: be_true
      to: be_truthy

* 10 conversions
    from: lambda { }.should_not
      to: expect { }.not_to

* 7 conversions
    from: > expected
      to: be > expected

* 6 conversions
    from: lambda { }.should
      to: expect { }.to

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

* 2 conversions
    from: >= expected
      to: be >= expected

* 2 conversions
    from: pending
      to: skip

* 1 conversion
    from: <= expected
      to: be <= expected

* 1 conversion
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 1 conversion
    from: obj.should_not_receive(:message)
      to: expect(obj).not_to receive(:message)

For more details: https://github.com/yujinakayama/transpec#supported-conversions
RSpec 3.0.0.
Fix README in examples/packet_in.
Merge branches 'develop' and 'develop' of https://github.com/trema/trema-edge into develop