Commented Issue: Add Mid-Tier device checking [213]

See http://blogs.microsoft.co.il/blogs/alex_golesh/archive/2012/02/27/windows-phone-sdk-7-1-1-update-ctp-what-s-new.aspx
Comments: You should not use DeviceExtendedProperties is not absolutely necessary, as it requires ID_CAP_IDENTITY_DEVICE. See http://windowsphonegeek.com/tips/Windows-Phone-7-vs-Windows-Phone-Mango-Getting-Device-Information long additionalUsableMemory = DeviceStatus.ApplicationMemoryUsageLimit – DeviceStatus.ApplicationCurrentMemoryUsage;