Include symbols for the nuget packages (graphql-dotnet#603)

* add --include-symblos to the main nuget package in order to get pdbs and source available via a source server
* Include sources as well
* make appveyor push symbol packages

Author: derwasp

appveyor.yml

@@ -31,7 +31,7 @@ deploy:
   server: https://www.myget.org/F/graphql-dotnet/api/v2/package
   api_key:
     secure: +l1vfBMajn1WfmXkQ2LdILKxK4fQ5AHSnnU1kf11Bn1xRGUOTCdPhLwHx232piEn
-  skip_symbols: true
+  skip_symbols: false
   on:
     branch:
       - master

tools/tasks/dotnetPack.js

@@ -24,7 +24,7 @@ export default function compile() {
     versionSuffix = `--version-suffix ${settings.versionSuffix}${settings.revision}`;
   }
 
-  const cmd = `dotnet pack src/GraphQL -o ${settings.artifacts} -c ${settings.target} ${versionSuffix}`
+  const cmd = `dotnet pack src/GraphQL -o ${settings.artifacts} -c ${settings.target} ${versionSuffix} --include-symbols --include-source`
   const one = run(cmd)
 
   const cmd2 = `dotnet pack src/GraphQL.StarWars -o ${settings.artifacts} -c ${settings.target}`