Fix LRS retrieve profile methods

* Similar fix to previous one for State where the profile itself wasn't
  attached to the LRS response object in the content
* Added unit test assertion to confirm LRS response content is correct
  kind of requested document

TinCan/RemoteLRS.cs

@@ -655,6 +655,7 @@ public ActivityProfileLRSResponse RetrieveActivityProfile(String id, Activity ac
                 return r;
             }
             r.success = true;
+            r.content = profile;
 
             return r;
         }
@@ -705,6 +706,7 @@ public AgentProfileLRSResponse RetrieveAgentProfile(String id, Agent agent)
                 return r;
             }
             r.success = true;
+            r.content = profile;
 
             return r;
         }

TinCanTests/RemoteLRSResourceTest.cs

@@ -229,6 +229,7 @@ public void TestRetrieveState()
         {
             StateLRSResponse lrsRes = lrs.RetrieveState("test", Support.activity, Support.agent);
             Assert.IsTrue(lrsRes.success);
+            Assert.IsInstanceOf<TinCan.Documents.StateDocument>(lrsRes.content);
         }
 
         [Test]
@@ -275,6 +276,7 @@ public void TestRetrieveActivityProfile()
         {
             ActivityProfileLRSResponse lrsRes = lrs.RetrieveActivityProfile("test", Support.activity);
             Assert.IsTrue(lrsRes.success);
+            Assert.IsInstanceOf<TinCan.Documents.ActivityProfileDocument>(lrsRes.content);
         }
 
         [Test]
@@ -312,6 +314,7 @@ public void TestRetrieveAgentProfile()
         {
             AgentProfileLRSResponse lrsRes = lrs.RetrieveAgentProfile("test", Support.agent);
             Assert.IsTrue(lrsRes.success);
+            Assert.IsInstanceOf<TinCan.Documents.AgentProfileDocument>(lrsRes.content);
         }
 
         [Test]