remove curb http_client, add persistent instead.
Browserstack project rename
Allow for rspec 2.99.0 & 3x, remove more curb stuff in favour of NET:HTTP.
Remove vendored browserstack binaries from repo (closes #23), and rework how the tunnel is process is handled.
Linters
Convert specs to RSpec 3.0.0 syntax with Transpec

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

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

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

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

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

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

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Lower coverage for now