Update README.md

Update the download page link from the deleted wiki page to release page.
Update Windows Azure to Microsoft Azure
Microsoft Azure Pack is actually still called Windows Azure Pack, even though Windows Azure is now Microsoft Azure
Update windowsazure.com to azure.microsoft.com
Merge pull request #2460 from andrerod/master

Microsoft Azure Pack is still called Windows Azure Pack
Adding the Set-AzureVnetGatewayKey cmdlet

This commit adds the Set-AzureVnetGatewayKey cmdlet, as well as importing the latest nuget Network Management Library.
add test project for managedcache
Merge pull request #1 from daschult/master

Adding the Set-AzureVnetGatewayKey cmdlet
Finish up the New Azure Managed Cache command
Add Get Cache Service Command
Implement Delete command
address review feedback
Merge pull request #2479 from yugangw-msft/newcache

Implement New and Get Azure Managed Cache commands
Merge branch 'dev' of https://github.com/brooklyngwdev/azure-sdk-tools into dev

Conflicts:
	WindowsAzurePowershell/src/Commands.ServiceManagement.Preview/packages.config
	WindowsAzurePowershell/src/Commands.ServiceManagement/packages.config
Merge branch 'dev' of https://github.com/Azure/azure-sdk-tools into dev
Merge branch 'master' of https://github.com/Azure/azure-sdk-tools into dev
Merge branch 'dev' of https://github.com/daschult/azure-sdk-tools into dev