Build \WindowsAzurePowershell\src\WindowsAzurePowershell.sln. Build all project in the solution, you can select build->build solution menu.
Build \WindowsAzurePowershell\setup\azurepowershell.sln and get installation application from \WindowsAzurePowershell\setup\build\Debug\x86\windowsazure-powershell.msi
Install Windows Azure PowerShell and get version from file C:\Program Files (x86)\Microsoft SDKs\Windows Azure\PowerShell\Azure\Azure.psd1 which you can double check whether you want.