Edited Issue: Installing Corlib package to windows phone project will cause unintallation error (when clicking uninstall button for another package) and asked to restart the project. [2877]

Repro steps:<br />1. create a new windows phone app<br />2. open nuget package manager dialog, search for atomic<br />3. install atomicphonemvvm package and then click install button to CorLib package<br /><br />Expected: An error dialog saying The corlib package does not match the wondows phone 8.0 target framework<br /><br />Actual: an error dialog says the following:<br /><br />Successfully installed 'CorLib 0.0.6.27804'.<br />The process cannot access the file 'c:\Users\danliu\Documents\Visual Studio 2012\Projects\PhoneApp18\packages\CorLib.0.0.6.27804\lib\net40-Client\Corlib.dll' because it is being used by another process.<br />Successfully uninstalled 'CorLib 0.0.6.27804'.<br />Install failed. Rolling back...<br />Could not install package 'CorLib 0.0.6.27804'. You are trying to install this package into a project that targets 'WindowsPhone,Version=v8.0', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.<br /><br />4. now click Close button. Go to installed packages tab, click Uninstall atomicphonemvvm package<br /><br />Expected: The atomicphonemvvm package can be uninstalled successfully<br /><br />Actual: There is an error shown on the dialog, which says:<br />One or more packages could not be completely removed: CorLib.0.0.6.27804. Restart Visual Studio to finish uninstall.