title: Cannot install package via nuget
body: <p>Have been trying a clean install of <code>umbraco</code> all afternoon in <code>Visual Studio 2015</code>. I am receiving complaints about a particular package <code>ImageProcessor</code>. Just trying to install it this package separately yields the same not very helpful message. These things are supposed to <em>just</em> work aren't they?</p>
  
  <p>Interestingly I can install anything up to and including version <code>2.3.2</code></p>
  
  <p>Exasperated I uninstalled VS 2015 and reinstalled. Also removed nuget from that and re-added it. No idea how we are supposed to "debug" these things hoping someone with similar pain in the past can share a solution. This is the gist of it:</p>
  
  <pre><code>&gt; PM&gt; install-package imageprocessor Attempting to gather dependency
  &gt; information for package 'imageprocessor.2.3.3' with respect to project
  &gt; 'Show.Umbraco', targeting '.NETFramework,Version=v4.5.1' Attempting to
  &gt; resolve dependencies for package 'imageprocessor.2.3.3' with
  &gt; DependencyBehavior 'Lowest' Resolving actions to install package
  &gt; 'imageprocessor.2.3.3' Resolved actions to install package
  &gt; 'imageprocessor.2.3.3' Install failed. Rolling back... Package
  &gt; 'ImageProcessor.2.3.3' does not exist in project 'Show.Umbraco'
  &gt; Package 'ImageProcessor.2.3.3' does not exist in folder
  &gt; 'C:\_dev\Show\Show.Umbraco\packages' install-package : Could not
  &gt; install package 'ImageProcessor 2.3.3'. You are trying to install this
  &gt; package into a project that targets '.NETFramework,Version=v4.5.1',
  &gt; but the package does not contain any assembly references or content
  &gt; files that are  compatible with that framework. For more information,
  &gt; contact the package author. At line:1 char:1
  &gt; + install-package imageprocessor
  &gt; + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  &gt;     + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
  &gt;     + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
  </code></pre>