ignore Xamarin userprefs
Jint project file Mono .Net 3.5 build
ambiguous call to Floor(double x) or Floor(decimal x)
removed Pure attribute, ExpandoObject, which can't be supported under .Net 3.5
compiler warning: The keyword new is required on 'Source' because it hides inherited member 'Source'

http://msdn.microsoft.com/en-us/library/435f1dw2.aspx
.Net 3.5 Attributes lacks HasFlag, use FieldInfo IsInitOnly instead.