Add Functional Tests

[cfbarbero]

We need to add some functional, end to end tests of the SlowCheetah nuget package and build transforms.

Scenarios:

• Transform app.config for C# projects on build
• Transform other xml files for C# projects on build
• Transform xml files besides web.config for web projects on publish/package
• Transform files for Click Once publish
• Transform files for setup project
• Support for PublishProfile transform on non web projects
• Transform xml files for worker role (used to work I don't think it does anymore not 100% sure)
• Transform Linked files

Tests:
Install slow-cheetah package into new project.
Build Project
Verify scenario

[cfbarbero]

The Nuget Functional Testing looks promising, however, it looks like it's only for internal testing of the Nuget project and has to be run inside of Visual Studio.