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

source/ChromeDevTools/Properties/AssemblyInfo.cs

...ce/ChromeDevTools/Protocol/Chrome/Accessibility/AXNode.cs

...evTools/Protocol/Chrome/Accessibility/AXPropertySource.cs

...meDevTools/Protocol/Chrome/Accessibility/AXRelatedNode.cs

...e/ChromeDevTools/Protocol/Chrome/Accessibility/AXValue.cs

...Protocol/Chrome/Accessibility/GetAXNodeCommandResponse.cs

...ChromeDevTools/Protocol/Chrome/Animation/AnimationNode.cs

...Protocol/Chrome/Animation/AnimationPlayerCanceledEvent.cs

.../Protocol/Chrome/Animation/AnimationPlayerCreatedEvent.cs

...ChromeDevTools/Protocol/Chrome/Animation/KeyframesRule.cs

...me/ApplicationCache/ApplicationCacheStatusUpdatedEvent.cs

...tocol/Chrome/ApplicationCache/NetworkStateUpdatedEvent.cs

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

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

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

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

...ChromeDevTools/Protocol/Chrome/CSS/CSSStyleSheetHeader.cs

...tocol/Chrome/CSS/GetInlineStylesForNodeCommandResponse.cs

...ols/Protocol/Chrome/CSS/GetMatchedStylesForNodeCommand.cs

...ocol/Chrome/CSS/GetMatchedStylesForNodeCommandResponse.cs