Merge pull request #12 from quamotion/fixes/optional-arguments

...ls/Protocol/Chrome/ServiceWorker/WorkerTerminatedEvent.cs

...rotocol/Chrome/ServiceWorker/WorkerVersionUpdatedEvent.cs

...meDevTools/Protocol/Chrome/Timeline/EventRecordedEvent.cs

...e/ChromeDevTools/Protocol/Chrome/Timeline/StartCommand.cs

.../ChromeDevTools/Protocol/Chrome/Timeline/TimelineEvent.cs

...hromeDevTools/Protocol/Chrome/Tracing/BufferUsageEvent.cs

...omeDevTools/Protocol/Chrome/Tracing/DataCollectedEvent.cs

...ce/ChromeDevTools/Protocol/Chrome/Tracing/StartCommand.cs

...eDevTools/Protocol/Chrome/Tracing/TracingCompleteEvent.cs

.../Protocol/Chrome/Worker/DispatchMessageFromWorkerEvent.cs

...romeDevTools/Protocol/Chrome/Worker/WorkerCreatedEvent.cs

...eDevTools/Protocol/Chrome/Worker/WorkerTerminatedEvent.cs

...OS/ApplicationCache/ApplicationCacheStatusUpdatedEvent.cs

...Protocol/iOS/ApplicationCache/NetworkStateUpdatedEvent.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSMedia.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSProperty.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSPropertyInfo.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSRule.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSSelector.cs

source/ChromeDevTools/Protocol/iOS/CSS/CSSStyle.cs