Build becomes the new compile. It decides which project to compile and how. It checks for incremental preconditions
Compile's resonsibility is trimmed down to only knowing how to invoke the compiler on a project
- Ported nuget package building code over from dnu. Moved that code to use NuGet v3 primitives.
- Simplified the package builder API
- Left out resources and schema detection for now
- This folder should remain self contained as the code will be copied into NuGet v3.
- Missing features include symbols packages
