Add support for c++ member function
Add AllowedType support, templated constructor, fix const and reference for Variable, lightuserdata support, test for cppfunction. Changed constructor(State*) to factory function FromStack
Fix usage of FromMemberFunction in test
Add support for cppobject userdata, ReturnValue class for function call
Add operator for cpp class, check stack, fix stack not clear due to ReturnValue
Fix argument order in function call, fix g++ error
Fix function names of ReturnValue
Fix changes of function names in test
Merge pull request #1 from acaly/master

Add support for c++ member function