Add back explicit DNX451 buid while we clarify which netstandard to target

Dapper.DNX.Tests/project.json

@@ -63,7 +63,7 @@
       },
       "dependencies": {
         "xunit": "2.1.0",
-        "xunit.runner.dnx": "2.1.0-rc1-build204"
+        "xunit.runner.dnx": "2.1.0-*"
       }
     },
     "dnxcore50": {
@@ -72,7 +72,7 @@
       },
       "dependencies": {
         "xunit": "2.1.0",
-        "xunit.runner.dnx": "2.1.0-rc1-build204"
+        "xunit.runner.dnx": "2.1.0-*"
       }
     }
   }

Dapper.StrongName/project.json

@@ -33,6 +33,15 @@
         "System.Data": "4.0.0.0"
       }
     },
+    "dnx451": {
+      "frameworkAssemblies": {
+        "System.Data": "4.0.0.0",
+        "System.Xml": "4.0.0.0"
+      },
+      "compilationOptions": {
+        "define": [ "ASYNC" ]
+      }
+    },
     "dotnet5.4": {
       "compilationOptions": {
         "define": [ "ASYNC", "COREFX" ]

Dapper/project.json

@@ -31,6 +31,15 @@
         "System.Xml": "4.0.0.0"
       }
     },
+    "dnx451": {
+      "frameworkAssemblies": {
+        "System.Data": "4.0.0.0",
+        "System.Xml": "4.0.0.0"
+      },
+      "compilationOptions": {
+        "define": [ "ASYNC" ]
+      }
+    },
     "dotnet5.4": {
       "compilationOptions": {
         "define": [ "ASYNC", "COREFX" ]