added unit test. made if condition easier to understand.

TestAssets/TestProjects/TestLibraryWithMultipleFrameworks/Program.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main()
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

TestAssets/TestProjects/TestLibraryWithMultipleFrameworks/project.json

@@ -0,0 +1,20 @@
+{
+    "version": "1.0.0-*",
+    "compilationOptions": {
+        "emitEntryPoint": false
+    },
+
+    "dependencies": { },
+
+    "frameworks": {
+        "net20": { },
+        "net35": { },
+        "net40": { },
+        "net461": { },
+        "dnxcore50": { 
+            "dependencies": {
+                "NETStandard.Library": "1.0.0-rc2-23811"
+            }
+        }
+    }
+}