Adding support for output file name for apps.

TestAssets/TestProjects/AppWithOutputAssemblyName/Program.cs

@@ -0,0 +1,10 @@
+namespace AppWithOutputAssemblyName
+{
+    public class MyApp
+    {
+        public static void Main()
+        {
+            System.Console.WriteLine("Hello, World!");
+        }
+    }
+}

TestAssets/TestProjects/AppWithOutputAssemblyName/project.json

@@ -0,0 +1,15 @@
+{
+    "compilationOptions": {
+        "outputName": "MyApp",
+        "emitEntryPoint": true,
+        "preserveCompilationContext": true
+    },
+    "dependencies": {
+        "NETStandard.Library": "1.0.0-rc2-23901"
+    },
+    "frameworks": {
+        "netstandardapp1.5": {
+            "imports": "dnxcore50"
+        }
+    }
+}