message: Add Boost 1.63 Python config for AppVeyor
diff: BOND_VS_NUM: 14
  BOND_ARCH: 32
  BOND_BOOST: 60
  + - BOND_BUILD: Python
  + BOND_VS: "Visual Studio 14 2015"
  + BOND_VS_NUM: 14
  + BOND_ARCH: 64
  + BOND_BOOST: 63
  - BOND_BUILD: C++
  BOND_VS: "Visual Studio 14 2015"
  BOND_VS_NUM: 14
  