Documentation should include version numbers

[GoogleCodeExporter]

We should be able to include "Introduced in 1.1.0" or whatever in version 
numbers, for the autogenerated documentation.

It shouldn't be too hard to do this as part of the AnnotationDocumenter tool. 
(We don't actually need annotations, but it's similar "XML documentation 
post-processing".)

This should be automatic based on previous XML documentation files.

Unfortunately as far as I can see, there's no specific XML tag for this. I've 
raised https://shfb.codeplex.com/discussions/476990 to ask for advice.

Original issue reported on code.google.com by jonathan.skeet on 24 Dec 2013 at 12:28