avoid asking omnishapr to parse project.json files from NuGet packages,

Also drop this .csproj file, that never helped.

omnisharp.json

@@ -2,18 +2,18 @@
   "Dnx": {
     "enabled": true,
     "enablePackageRestore": false,
-    "projects": "**/project.json"
+    "projects": "src/**/project.json;test/**/project.json" 
   },
   "MSBuild": {
     "enabled": false
   },
   "DotNet": {
     "enabled": false,
-    "enablePackageRestore": true,
+    "enablePackageRestore": false,
     "script": {
       "enableScriptNuGetReferences": true,
       "defaultTargetFramework": "dnx451"
     }
   },
   "packages": "packages"
-}
+}