title: Created nuget package's dll can not be accessable from package's loaded project
body: <p>I want to create a nuget package of my .net core class library. </p>
  
  <ol>
  <li>I copied the nuget.exe file to the root folder of my Solution</li>
  <li><p>Run nuget spec and Solution.nuspec file created. I modified it as below:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;package &gt;
  &lt;metadata&gt;
  &lt;id&gt;Solution&lt;/id&gt;
  &lt;version&gt;1.0.0&lt;/version&gt;
  &lt;authors&gt;cc Team&lt;/authors&gt;
  &lt;owners&gt;cc&lt;/owners&gt;
  &lt;licenseUrl&gt;&lt;/licenseUrl&gt;
  &lt;projectUrl&gt;&lt;/projectUrl&gt;
  &lt;iconUrl&gt;&lt;/iconUrl&gt;
  &lt;requireLicenseAcceptance&gt;false&lt;/requireLicenseAcceptance&gt;
  &lt;description&gt;&lt;/description&gt;
  &lt;releaseNotes&gt;&lt;/releaseNotes&gt;
  &lt;copyright&gt;Copyright 2017&lt;/copyright&gt;
  &lt;tags&gt;c# .net&lt;/tags&gt;
  &lt;dependencies&gt;
      &lt;dependency id="NETStandard.Library" version="1.6.1" /&gt;
  &lt;/dependencies&gt;
  &lt;references&gt;
      &lt;reference file="Solution.dll" /&gt;
  &lt;/references&gt;
  &lt;/metadata&gt;
  &lt;files&gt;
  &lt;file src="Solution.dll" target="lib\netstandard1.6\Solution.dll"/&gt;
  </code></pre>
  
  <p>
     <br>
     </p></li>
  </ol>
  
  <p>file's node src value outpupath of my solution. (bin\Release\netstandard1.6\Solution.dll)</p>
  
  <ol>
  <li>Run nuget pack Solution.nuspec and  Solution.nupkg file created.</li>
  <li>I put it to my package source.</li>
  <li>Create a new .net core class library and select my Solution nuget package from local package source. It added to my project. There is no error or warning. But When I try to access a class from my Solution nuget package, it couldn't be found.I dowloaded  'Nuget Package Explorer' and opened my Solution.nupkg. Icould see Solution.dll and Solution.pdb file under lib --> netstandart1.6.</li>
  </ol>
  
  <p>Then I searched about the error and found this :</p>
  
  <pre><code>"scripts": {
  "postcompile": [
    "dotnet pack --no-build --configuration %compile:Configuration%"
  ]
  }
  </code></pre>
  
  <p>After compile my Solution project it creates Solution.1.0.0-0.nupkg file and Solution.1.0.0-0.symbols. I put it to my local package source but these packages are not listed in the 'Nuget Package Manager'.</p>
  
  <p>Do you have any idea?</p>