Added tostring member to LuaRef
Added tostring member to LuaRef

LuaRef::tostring uses the tostring function in lua
LuaRef::print has been changed to also print the
tostring result to more closely mimic the behavior
of the print function in lua.

xlgames-inc/XLE,xlgames-inc/XLE,yorung/XLE,yorung/XLE,yorung/XLE,xlgames-inc/XLE,yorung/XLE,xlgames-inc/XLE,xlgames-inc/XLE,xlgames-inc/XLE,yorung/XLE,yorung/XLE,xlgames-inc/XLE,yorung/XLE,xlgames-inc/XLE,yorung/XLE