Generate downloadable migrations file for content type code generation

[I3undy]

@Piedone created on Jul 21, 2015:
https://helpfulextensions.codeplex.com/workitem/6

Be able to click on a button where a .cs file with a complete migration class will be generated.

[Piedone]

Let's not do this: I don't see much of a point since we already have code snippets.