Add packages tree view to Manage Packages dialog.
Display NuGet icon with each package.
Hide column header in packages list.
Show selected package information in Manage Packages dialog.

When a package is selected the following package information is shown on the right hand side of the dialog:
  Created by
  Version
  Authors
  Downloads
  Package description
Fix blank package summary in Manage Packages dialog packages list.

Display NuGet package description if the summary is missing.
Manage Packages dialog now supports installing/uninstalling packages.

Buttons added: Add/Remove and Manage.
No support for adding/removing packages for multiple projects in a solution.
No support for accepting a package's license agreement.
Remove obsolete menu items.

Install, Uninstall and Update package menu options now removed.
Update enabled buttons after package is installed/uninstalled.
Show package operation messages in Manage Packages dialog.
Give package operations text view more height when expanded.
Do not hide Add/Remove/Manage buttons in Manage Packages dialog.

Move the buttons outside the package information frame so when the
messages text view is expanded the buttons are not hidden.
Update readme.
Add hyperlinks to Manage Packages dialog.

Add license url and project url hyperlink buttons.
Merge branch 'master' of https://github.com/Kwal/monodevelop-nuget-addin