Port user info changes over from Raygun4net
Merge pull request #1 from MindscapeHQ/user-improvements

Port user info changes over from Raygun4net
Hard-code version in client-message. Removed unused variable.
Replaced pInvokes with Unity methods.
Use correct WWW constructor.
Removed/replaced incompatible code.
Disable linq to support iOS devices.
Additional environment variables.
Reverted back to auto properties.