Preview version 0.6.0

Version 0.6.0

• Added support for MSVC (Visual Studio) 2015
• Added tuned parameters for various devices (see README)
• Now automatically generates C++ code from JSON tuning results
• Added level-2 routines:
  • SGER/DGER
  • CGERU/ZGERU
  • CGERC/ZGERC
  • CHER/ZHER
  • CHPR/ZHPR
  • CHER2/ZHER2
  • CHPR2/ZHPR2
  • CSYR/ZSYR
  • CSPR/ZSPR
  • CSYR2/ZSYR2
  • CSPR2/ZSPR2