0.6.4

Changelog 0.6.4

• Major change:
  - Add more options to control training, for more details, please check by --helpfull.
  - Add --ensemble mode when doing inference, to learn more about "ensemble", see EDSR paper.

• Bug fix:

  • wrong logic when use -f, -f2, -f3 to add custom callbacks together
  • wrong notification in Loader