Diagnostics: Make ErrorPage show nested exception types and messages. Make the default details display conditional based on host.AppMode.
Added ability to pick cors policy on a per request bases.
- Added ICorsPolicyProvider and default CorsPolicyProvider
that allows users to specify a callback.
- Changed CorsOptions to have an ICorsPolicyProvider property
- Added some tests

#578
Stylecop.
Adjusting Map extension methods to flow stage hints properly
Hosting: Remove zero parameter overloads of WebApp.Start. Require Port, Url, or Options.
Perf: Fix some dependency versions.
Build: Set up servicing attribute. Make strong name version different for dual compiled assemblies.
Updating headers, running code cleanup
Updating headers, code formatting
Updating headers, code formatting
Updating headers, code formatting
Updating headers, code formatting
Updating headers, code formatting
Updating headers, code formatting
Updating headers, code formatting
Copyright headers, code formatting
Removing remaining redundant overloads
Updating doc comments
Fxcop fix
Adding defaults to serialized values