[C++-sig] Pyste: patch to fix overloaded method with policy generation bug

[Baptiste Lepilleur]

    Pyste generates wrong code in the case of methods with overload and a
specific return value policy. The code compile but when called from python
lead to a 'can not resolve ++ call' failure (it only works if all the
arguments are specified).

For example:
class NonVirtualReturnValuePolicy
{
public:
 ValueHolder *set( const std::string &name_, int size_ = 10, int width_ =
12 )
};


The following code is generated:
.def("set",
     &NonVirtualReturnValuePolicy::set,
     return_internal_reference< 1 >(),
     py::NonVirtualReturnValuePolicy_set_overloads_1_3())


instead of:
.def("set",
     &NonVirtualReturnValuePolicy::set,
     py::NonVirtualReturnValuePolicy_set_overloads_1_3()[
  return_internal_reference< 1 >() ] )

=> the policy should be specified in square bracket.

    The attached patch fix this.

    Baptiste Lepilleur
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