PowerShell Module for Azure Stream Analytics Service

PowerShell Module for Azure Stream Analytics Service
The convention that we have been using in AzurePowerShell is to use short cmdlet names as possible. the prefix `StreamAnalytics` looks too long for a prefix. I'd suggest renaming this to `SA` instead. For example we have other services like:
ServiceBus --> SB, example: New-AzureSBNamespace
AzureDataFactory --> ADF, example: New-AzureADFAccount
etc...