Background and scenario descriptions not supported

[ciaranmcnulty]

When we have a background description, it's captured as part of the background's title

Removing this line produces a failing test

Gherkin/tests/Cucumber/CompatibilityTest.php

Line 44 in 38b23b3

'descriptions.feature' => 'Examples table descriptions not supported',

[ciaranmcnulty]

We do parse these ok, but we conflate them into the title (with line breaks) rather than having a separate description field

[acoulton]

Fixed by #361