Make only pages get written out as files. Attributes get written out as sub-items within the page.
n2cms/n2cms#174 proposed fix to NullReferenceException that occurs when trying to import Dinamico -> XML
Resolves n2cms/n2cms#176 Non-page Content Items are written out to current working directory rather than the data directory
Don't throw an exception when property is not found. Return null instead.
DocViewerUtility can now be rendered even if the site doesn't have a start page.
builder.GetChildren(null) returns null
Remove use of dynamic Content.Data to enable static rendering during serialization process.