Support Swig 3.0.5

[abicky]

This commit will fix the error like below with Swig 3.0.5 (I have confirmed on Mac OS 10.10.2 and Debian 6.0.5) mentioned in Stackoverflow:

% cd swig/python
% ./prepare.sh --swig
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (directorout) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &DIRECTOROUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (in) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (in) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (typecheck) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (typecheck) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (argout) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *OUTPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (argout) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &OUTPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (typecheck) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (typecheck) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (freearg) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > *INOUT
/usr/local/Cellar/swig/3.0.5/share/swig/3.0.5/std/std_vector.i:87: Error: Can't copy typemap (freearg) std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INPUT = std::vector< CRFSuite::Item,std::allocator< CRFSuite::Item > > &INOUT

It also will fix the error like below with Swig 2.0.4 mentioned in README for Python binding:

export_wrap.cpp:5020: error: redefinition of ‘struct swig::traits<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> > >’
export_wrap.cpp:4919: error: previous definition of ‘struct swig::traits<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> > >’

[chokkan]

Thank you for sending this patch. I could confirm this works on both swig 2.x and 3.x.