Metadata CSDL/EDMX generation from markdown source

[sumurthy]

Enhance the CSDL file generation from the markdown scanner tool. The goal is to take a set of spec files defined in markdown standard format and generate CSDL with required annotations.

• Descriptions for EntityType, ComplexType, actions, Functions, etc.
• Annotate undefined methods (such as delete not supported, etc.)
• Make the edmx additive (allow you to publish edmx starting with an edmx and building on top of that)
• Matt needs to tell Ryan what annotations should be in the EDMX so markdown-scanner can generate them

[rgregg]

Some of this is already implemented. We need to refine the requirements so we can finish the work. See CsdlWriter

[rgregg]

I'm working on this in my branch: https://github.com/rgregg/markdown-scanner/tree/generate-annotation