bicgstab_tag and cg_tag not working

but lower_tag and upper_tag are working. 

Python argument types in
    pyviennacl._viennacl.iterative_solve(matrix_row_float, vector_float, bicgstab_tag)
did not match C++ signature:

or:

Python argument types in
    pyviennacl._viennacl.iterative_solve(matrix_row_float, vector_float, cg_tag)
did not match C++ signature:
