Add support for enum class

[Systemcluster]

It would be convenient to have enum class support similar to how classes are implemented.

enum class EnumClass {
    Hesiod = 0,
    Theia = 1
};

state["EnumClass"].SetEnumClass<EnumClass>(
    "Hesiod", EnumClass::Hesiod, 
    "Theia", EnumClass::Theia);

--lua.lua
var = EnumClass.new("Hesiod")
someFunction(var) -- some function with an EnumClass parameter

[jeremyong]

Getting to this this weekend.

[vheuken]

@jeremyong Any chance you might give this another shot?

[jbl4ir]

@jeremyong I'd like to second this request. Thanks for all your hard work on Selene!

[DontBelieveMe]

This issue was moved to DontBelieveMe/Selene#7