switch off CA in release build
extracted SkippedScenarioFeature from ScenarioFeature
renamed SkipFeature to SkippedStepFeature
renamed InIsolationFeature to IsolatedStepFeature
renamed UsingFeature to ObjectDisposalFeature
updated readme.md
Merge pull request #94 from adamralph/feature-coverage

moved features around to match docs and trimmed readme