Commented Issue: Unable to install Caliburn with nuget (WP 7.1) [289]

Hello,

When I try to use nuget for Windows Phone 7.1 application I get following error message:

```
Successfully installed 'Caliburn.Micro 1.4.1'.
Successfully uninstalled 'Caliburn.Micro 1.4.1'.
Install failed. Rolling back...
Install-Package : Could not install package 'Caliburn.Micro 1.4.1'. You are trying to install this package into a project that targets 'Silverlight,Version=v4.0,Profile=WindowsPhone71', but the package does not c
ontain any assembly references that are compatible with that framework. For more information, contact the package author.
At line:1 char:2
+ Install-Package Caliburn.Micro
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
```

I've also tried to install it for Windows Phone 8 project with the same error message:

```
Install-Package : Could not install package 'Caliburn.Micro 1.4.1'. You are trying to install this package into a project that targets 'WindowsPhone,Version=v8.0', but the package does not contain any assembly re
ferences that are compatible with that framework. For more information, contact the package author.
At line:1 char:2
+ Install-Package Caliburn.Micro
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
```

I'm using:
Windows 8 64bit
Visual Studio Express 2012 for Windows Phone (Version 11.0.50727.38 WPTOOLSREL)

Thank you for help
Comments: Seems to be a duplicate of issue [#266](https://caliburnmicro.codeplex.com/workitem/266) Please update NuGet to the latest version.