Minor updates

1. Added support for second type of ps file:

```
    <?xml version="1.0" encoding="utf-8"?>
    <PublishData>
      <PublishProfile
        PublishMethod="AzureServiceManagementAPI"
        Url="https://management.core.windows.net"
        ManagementCertificate="cert here">
        <Subscription
          Id="id here"
          Name="sub name" />
      </PublishProfile>
    </PublishData>
```

2. Protected temporary Azure cert file.

3. README updates.