NuSpec package summary and description updates.
Merge branch 'dev' of https://github.com/jeffwilcox/azure-sdk-for-net into dev

Conflicts:
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.Compute.nuspec
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.Libraries.nuspec
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.Storage.nuspec
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.VirtualNetworks.nuspec
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.WebSites.nuspec
	libraries/src/PackageSpecs/Microsoft.WindowsAzure.Management.nuspec