the codebehind still exist in the web for backwards compatibility. Updated the logging so that the LogHelper
can now write to a TraceContext specified if debugging which is handy if we want to write to the normal trace.
Adds a few unit tests for DynamicDocument/DynamicNode and fixes both to properly support the 'Take' method
as this wasn't really working. Not sure how or why it was working previously. Have also allowed for extension
methods to be executed against either of these objects that accept IQueryable which was not supported before.
