Transition to netstandard.

- dotnet5.X => netstandard1.y (where y = x-1).
- DNXCore50 => netstandardapp1.5.
- Applied the same changes to ifdefs.

samples/StaticFileSample/project.json

@@ -13,10 +13,14 @@
     "Microsoft.NETCore.Platforms": "1.0.1-*"
   },
   "frameworks": {
-    "dnx451": { },
-    "dnxcore50": { }
+    "dnx451": {},
+    "netstandardapp1.5": {
+      "imports": [
+        "dnxcore50"
+      ]
+    }
   },
   "content": [
     "wwwroot/**/*"
   ]
-}
+}

src/Microsoft.AspNetCore.StaticFiles/project.json

@@ -3,7 +3,9 @@
   "compilationOptions": {
     "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
-    "nowarn": [ "CS1591" ],
+    "nowarn": [
+      "CS1591"
+    ],
     "xmlDoc": true
   },
   "description": "ASP.NET 5 static files middleware.",
@@ -20,6 +22,10 @@
   },
   "frameworks": {
     "net451": {},
-    "dotnet5.4": {}
+    "netstandard1.3": {
+      "imports": [
+        "dotnet5.4"
+      ]
+    }
   }
 }

test/Microsoft.AspNetCore.StaticFiles.Tests/project.json

@@ -16,11 +16,14 @@
     "xunit": "2.1.0"
   },
   "frameworks": {
-    "dnxcore50": {
+    "netstandardapp1.5": {
       "dependencies": {
         "dotnet-test-xunit": "1.0.0-dev-*"
       },
-      "imports": "portable-net451+win8"
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     },
     "net451": {
       "frameworkAssemblies": {