Transition to netstandard.

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

src/Microsoft.DotNet.Watcher.Core/project.json

@@ -19,8 +19,11 @@
     "Microsoft.NETCore.Platforms": "1.0.1-*"
   },
   "frameworks": {
-    "dnxcore50": {
-      "imports": "portable-net451+win8"
+    "netstandardapp1.5": {
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     }
   }
-}
+}

src/dotnet-watch/project.json

@@ -1,20 +1,23 @@
 {
-    "version": "1.0.0-*",
-    "compilationOptions": { 
-        "warningsAsErrors": true,
-        "emitEntryPoint": true,
-        "keyFile": "../../tools/Key.snk"
-    },
-    "dependencies": {
-        "Microsoft.DotNet.Watcher.Core": "1.0.0-*",
-        "Microsoft.Extensions.CommandLineUtils": "1.0.0-*",
-        "Microsoft.Extensions.Logging": "1.0.0-*",
-        "Microsoft.Extensions.Logging.Console": "1.0.0-*",
-        "Microsoft.NETCore.Platforms": "1.0.1-*"
-    }, 
-    "frameworks": {
-      "dnxcore50": {
-        "imports": "portable-net451+win8"
-      }
+  "version": "1.0.0-*",
+  "compilationOptions": {
+    "warningsAsErrors": true,
+    "emitEntryPoint": true,
+    "keyFile": "../../tools/Key.snk"
+  },
+  "dependencies": {
+    "Microsoft.DotNet.Watcher.Core": "1.0.0-*",
+    "Microsoft.Extensions.CommandLineUtils": "1.0.0-*",
+    "Microsoft.Extensions.Logging": "1.0.0-*",
+    "Microsoft.Extensions.Logging.Console": "1.0.0-*",
+    "Microsoft.NETCore.Platforms": "1.0.1-*"
+  },
+  "frameworks": {
+    "netstandardapp1.5": {
+      "imports": [
+        "dnxcore50",
+        "portable-net451+win8"
+      ]
     }
-}
+  }
+}