Organise dependencies.

src/ImageSharp/project.json

@@ -28,30 +28,43 @@
     "additionalArguments": [ "/additionalfile:stylecop.json" ]
   },
   "dependencies": {
-    "System.Collections": "4.0.11",
-    "System.Diagnostics.Debug": "4.0.11",
-    "System.Diagnostics.Tools": "4.0.1",
-    "System.IO": "4.1.0",
-    "System.IO.Compression": "4.1.0",
-    "System.Linq": "4.1.0",
-    "System.Numerics.Vectors": "4.1.1",
-    "System.ObjectModel": "4.0.12",
-    "System.Resources.ResourceManager": "4.0.1",
-    "System.Runtime.CompilerServices.Unsafe": "4.0.0",
-    "System.Runtime.Extensions": "4.1.0",
-    "System.Runtime.InteropServices": "4.1.0",
-    "System.Runtime.Numerics": "4.0.1",
-    "System.Text.Encoding.Extensions": "4.0.11",
-    "System.Threading": "4.0.11",
-    "System.Threading.Tasks": "4.0.11",
-    "System.Threading.Tasks.Parallel": "4.0.1",
     "StyleCop.Analyzers": {
       "version": "1.0.0",
       "type": "build"
-    },
+    }
-    "System.Buffers": "4.0.0"
   },
   "frameworks": {
-    "netstandard1.1": {}
+    "netstandard1.1": {
+      "dependencies": {
+        "System.Buffers": "4.0.0",
+        "System.Collections": "4.0.11",
+        "System.Diagnostics.Debug": "4.0.11",
+        "System.Diagnostics.Tools": "4.0.1",
+        "System.IO": "4.1.0",
+        "System.IO.Compression": "4.1.0",
+        "System.Linq": "4.1.0",
+        "System.Numerics.Vectors": "4.1.1",
+        "System.ObjectModel": "4.0.12",
+        "System.Resources.ResourceManager": "4.0.1",
+        "System.Runtime.CompilerServices.Unsafe": "4.0.0",
+        "System.Runtime.Extensions": "4.1.0",
+        "System.Runtime.InteropServices": "4.1.0",
+        "System.Runtime.Numerics": "4.0.1",
+        "System.Text.Encoding.Extensions": "4.0.11",
+        "System.Threading": "4.0.11",
+        "System.Threading.Tasks": "4.0.11",
+        "System.Threading.Tasks.Parallel": "4.0.1"
+      }
+    },
+    "net45": {
+      "dependencies": {
+        "System.Buffers": "4.0.0",
+        "System.Numerics.Vectors": "4.1.1",
+        "System.Runtime.CompilerServices.Unsafe": "4.0.0"
+      },
+      "frameworkAssemblies": {
+        "System.Runtime": ""
+      }
+    }
   }
 }