no System.Drawing need by there

Yavsc.Server/project.json

@@ -72,15 +72,13 @@
     },
     "frameworks": {
         "dnx451": {
-          "frameworkAssemblies": {
-          "System.Json": "4.0.0"
-          }
+            "frameworkAssemblies": {
+                "System.Json": "4.0.0"
+            }
         },
         "net451": {
             "frameworkAssemblies": {
                 "System.ComponentModel.DataAnnotations": "4.0.0",
-  
-                "System.Drawing": "4.0.0",
                 "System.Json": "4.0.0",
                 "System.Net": "4.0.0.0",
                 "System.Net.Http": "4.0.0.0",
@@ -93,4 +91,4 @@
         "ef": "EntityFramework.Commands",
         "gen": "Microsoft.Extensions.CodeGeneration"
     }
-}
+}

Yavsc.Server/project.lock.json

@@ -12841,7 +12841,6 @@
     ],
     ".NETFramework,Version=v4.5.1": [
       "fx/System.ComponentModel.DataAnnotations >= 4.0.0",
-      "fx/System.Drawing >= 4.0.0",
       "fx/System.Json >= 4.0.0",
       "fx/System.Net >= 4.0.0",
       "fx/System.Net.Http >= 4.0.0",