Help updates

TFS items - 2100971, 2100963
Changed Windows Azure to Microsoft Azure branding

Changed Windows Azure to Microsoft Azure branding
Merge pull request #133 from singhkay/dev

Help updates
Help text change - New-AzureVM & New-AzureQuickVM

Changed the help text to reflect the correct new behavior on these two
cmdlets. If the service exists, then the Location & AffinityGroup is not
needed.
Merge pull request #134 from singhkay/dev

Help text change - New-AzureVM & New-AzureQuickVM
fix tests related with null parameters
Merge pull request #135 from AzureRT/dev

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