[WebApiOnOwin] Provide IAppBuilder extension which accepts HttpServer

- Codeplex bug : 1025

Incorporate code review feedback.

Fix portable library build break

[OData] Register atomsvc+xml formatter first to respond to service do…

…cument requests in XML if no Accept header is specified

RC Release

Fix for adding custom httproute. Before this fix, if one add custom

HttpRoute through the config.Routes.Add method, their GetRouteData method
and GetVirtualPath are ignored. Now it will get invoked properly.

Resolving client disconnection issues for self host server

Fixed issue with timings and SpanContextChanged flag.

Added extra "catch" around call to OnDocumentParseComplete handler to avoid bringing down the process due to a unhandled exception on a background thread.

Fixed sluggish editor behavior by removing Conditional Attribute opti…

…mization from design-time mode

Fixed issue with slash-escapes in Quoted Literal processing