Adding test cases for Get/Set/Remove-AzureVMBGInfoExtension cmdlets
Restore the vmaccess & generic extension cmdlets
Merge branch 'dev' of https://github.com/huangpf/azure-sdk-tools into template
Removing duplicate file AzureVMBGExtesnionTests.cs
Removing unused methods
Merge branch 'release-0.7.3' of https://github.com/WindowsAzure/azure-sdk-tools into template
Merge branch 'release-0.7.3' of https://github.com/WindowsAzure/azure-sdk-tools into template
Merge pull request #2327 from guangyang/release-0.7.3

Release 0.7.3
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into template
Update WAML-Compute to 0.9.11
Merge branch 'master' of https://github.com/WindowsAzure/azure-sdk-tools into template
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-tools into template

Conflicts:
	WindowsAzurePowershell/src/Commands.ServiceManagement/Model/DeploymentInfoContext.cs
Merge pull request #84 from v-didara/dev

Dev
Add-AzureProvisioningConfig Help Text
Get-AzureServiceAvailableExtension help texts.
Get-AzureVMAvailableExtension help texts; +2 more examples for Get-AzureServiceAvailableExtension help texts.
Set-AzureServiceExtension help texts.
New-AzureServiceExtensionConfig help texts
Set-AzureVMExtension help texts.
Get-AzureVMExtension help texts.