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

...e/ChromeDevTools/Protocol/Chrome/Page/ColorPickedEvent.cs

...evTools/Protocol/Chrome/Page/DomContentEventFiredEvent.cs

source/ChromeDevTools/Protocol/Chrome/Page/Frame.cs

...ChromeDevTools/Protocol/Chrome/Page/FrameAttachedEvent.cs

...tocol/Chrome/Page/FrameClearedScheduledNavigationEvent.cs

...ChromeDevTools/Protocol/Chrome/Page/FrameDetachedEvent.cs

...hromeDevTools/Protocol/Chrome/Page/FrameNavigatedEvent.cs

.../ChromeDevTools/Protocol/Chrome/Page/FrameResizedEvent.cs

.../ChromeDevTools/Protocol/Chrome/Page/FrameResourceTree.cs

...ols/Protocol/Chrome/Page/FrameScheduledNavigationEvent.cs

...DevTools/Protocol/Chrome/Page/FrameStartedLoadingEvent.cs

...DevTools/Protocol/Chrome/Page/FrameStoppedLoadingEvent.cs

...ols/Protocol/Chrome/Page/HandleJavaScriptDialogCommand.cs

...eDevTools/Protocol/Chrome/Page/InterstitialHiddenEvent.cs

...meDevTools/Protocol/Chrome/Page/InterstitialShownEvent.cs

...Tools/Protocol/Chrome/Page/JavascriptDialogClosedEvent.cs

...ools/Protocol/Chrome/Page/JavascriptDialogOpeningEvent.cs

...hromeDevTools/Protocol/Chrome/Page/LoadEventFiredEvent.cs

source/ChromeDevTools/Protocol/Chrome/Page/ReloadCommand.cs

...romeDevTools/Protocol/Chrome/Page/ScreencastFrameEvent.cs