don't remove unfinished imported games
don't pretend that imported games are being played
Merge branch 'master' into clarkeyUI

* master:
  don't pretend that imported games are being played
  don't remove unfinished imported games
fix game count
restore mouse wheel on analysis
fix puzzle 3D pieces
Merge branch 'master' into clarkeyUI

* master:
  fix puzzle 3D pieces
  restore mouse wheel on analysis
  fix game count
tweak challenges and messages previews
add light piece set
metal board
don't fail on invalid analysis path (from the URL)
deploy to new AI server
hotfixes
close message notifications
improve puzzle UI for slow, unreliable connections
maybe improve tournament for slow connections
new boards. the theme selector could be reorganized
upgrade mithril.js and chessground