Move to Rspec 3 syntax and update rspec version

[avgerin0s]

Changelog

• Update Rspec gem to version 3.2.0
• Update Cucumber gem to version 2.0.0
• Change all specs syntax to be compatible with the new rspec syntax.

Rspec reference

• obj.stub(:method) is converted to allow(obj).to receive(:method)
• expect(condition).to be_false is converted to expect(condition).to be_fausey
• expect(condition).to be_true is converted to expect(condition).to be_truthy

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The rationale behind this change is to have more clear specs and make it easier to maintain and extend our test suite which leads to easier adding/modifying of features.

[plribeiro3000]

Looking good so far! Great work. 👍

[avgerin0s]

@bensie @plribeiro3000 Please review it after the build passes :)

[avgerin0s]

Fixed cucumber features also. I think it's ready.

[bensie]

Looks awesome!