Razor MSBuild Task

## Usage

1. Install NuGet Package / Add ServiceStack.Razor.BuildTask.targets import to proj

2. Add the RazorFormat plugin, configuring which assemblies to look for Razor View Files

	*AppHost.cs*
	
		Plugins.Add(new RazorFormat { ScanAssemblies = new[] { typeof(Rockstar).Assembly } });

3. (Optional) Configure which build configuration(s) the Razor Build Task should build for
 - Leaving this out causes the Razor Build task to build for every configuration    

	*Host Project's Web/App.Config:* 
	  
		<add key="servicestack:razor:buildtask:allowedconfigurations" value="Debug, Mono, Release" />

	*Note: Having task enabled for DEBUG can be useful, as you get build-time compilation errors for Razor Views*

4. Set Build Action = Content for all the Razor View Files

**Done:** Razor Views are now loaded from the Assembly(ies)

![razorbuildtask](https://cloud.githubusercontent.com/assets/1469708/2729915/ed68c320-c610-11e3-9962-b16ae6090586.png)


## How it Works

 - SS.Razor modified to prefer loading from ScanAssemblies over using its IVirtualPathProvider
  - Compiled Razor View classes are located by searching for the attribute: [GeneratedCode].Tool == "RazorGenerator"
  - Razor View route paths are inferred from [VirtualPath].VirtualPath like normal

 - Razor Build Task generates the source-code in obj\$(Configuration)
 - Output of Razor Build Task is added to Host Project's "Compile" items
 - Generated source is built with Host Project, so any dependencies it requires are there at build time
  - To prevent, filename and namespace collisions, filename\namespaces are now automatically inferred from the $(RootNamespace) and the VirtualPath (see src\ServiceStack.Razor\RazorViewManager GetNamespace())
 - Uses the Host Project's Web/App.Config (see src\ServiceStack.Razor.BuildTask\AppConfigScope.cs)
  - Host Project's <system.web.webPages.razor /> section is made available to Razor Build Task
   - Namespaces, PageBaseType, etc
  - First tries to resolve web.config, then app.config, then <ProjectDllName>.config


## Dev Notes
 - Note-worthy files: 
  - src\ServiceStack.Razor.BuildTask\RazorGeneratorBuildTask.cs
  - tests\ServiceStack.Razor.BuildTask.Tests\RazorBuildTaskTests.cs
  - tests\ServiceStack.Razor.BuildTask.IntegrationTests\RazorBuildTaskIntegrationTests.cs 

 - Minimal dependencies (SS.interfaces, SS.Text, System.Web.Razor)
 - A lot of the project files are links similar to the Razorv4 project
 - Some of the Razor compilation currently depends on things like HostContext
  - Some work towards separting the compliation from the rest of SS projects has been made
   - Would result in no dependencies for Build Task
  - Currently, the few places that have dependencies outside the above 3 DLLs have been added as "polyfills" in ServiceStack.Razor.BuildTask\Support to keep the project's number of dependencies low
   - Sometimes this was advantageous, as slightly different functionality of these parts made the MSBuildTask easier to work with