Made Injector#setParentInjector public to enable turning independentl…

…y created injectors into child injectors.

This is mainly meant to be used in the context of Robotlegs, which subclasses Injector to allow for using swappable injector implementations through a uniform interface.
Because SwiftSuspenders must not have a dependency on Robotlegs, we can't internally create an instance of Robotlegs' SwiftSuspendersInjector. Using the public setParentInjector method, it's possible to manually instantiate SwiftSuspendersInjector and set the parent context's injector as the parent injector afterwards.

src/org/swiftsuspenders/Injector.as

@@ -184,6 +184,11 @@ package org.swiftsuspenders
 			injector.setParentInjector(this);
 			return injector;
 		}
+
+		public function setParentInjector(parentInjector : Injector) : void
+		{
+			m_parentInjector = parentInjector;
+		}
 
 
 		/*******************************************************************************************
@@ -316,10 +321,5 @@ package org.swiftsuspenders
 					getInjectionPoints(Class(getDefinitionByName(parentClassName)));
 			injectionPoints.push.apply(injectionPoints, parentInjectionPoints);
 		}
-
-		private function setParentInjector(parentInjector : Injector) : void
-		{
-			m_parentInjector = parentInjector;
-		}
 	}
 }