Adding an IUnitOfWorkDependency lifecycle

IUnitOfWork paints a component that it shared, but may only exist at per-request, -commandline, or -background task level
The TransactionManager is a prime example of a component that would restrict itself to unit of work only
This enables the ioc container to throw an exception when a singleton component depends directly or indirectly on something which it should not

--HG--
branch : perf
extra : rebase_source : bbe83ed7acc542e484c1b32ca81861dc07c1eb0e

src/Orchard/Environment/ShellBuilders/ShellContainerFactory.cs

@@ -71,6 +71,9 @@ namespace Orchard.Environment.ShellBuilders {
                             registration = registration.As(interfaceType);
                             if (typeof(ISingletonDependency).IsAssignableFrom(interfaceType)) {
                                 registration = registration.InstancePerMatchingLifetimeScope("shell");
+                            } 
+                            else if (typeof(IUnitOfWorkDependency).IsAssignableFrom(interfaceType)) {
+                                registration = registration.InstancePerMatchingLifetimeScope("work");
                             }
                             else if (typeof(ITransientDependency).IsAssignableFrom(interfaceType)) {
                                 registration = registration.InstancePerDependency();

src/Orchard/IDependency.cs

@@ -14,12 +14,20 @@ namespace Orchard {
     public interface ISingletonDependency : IDependency {
     }
 
+    /// <summary>
+    /// Base interface for services that may *only* be instantiated in a unit of work.
+    /// This interface is used to guarantee they are not accidentally referenced by a singleton dependency.
+    /// </summary>
+    public interface IUnitOfWorkDependency : IDependency {
+    }
+
     /// <summary>
     /// Base interface for services that are instantiated per usage.
     /// </summary>
     public interface ITransientDependency : IDependency {
     }
 
+
     public abstract class Component : IDependency {
         protected Component() {
             Logger = NullLogger.Instance;