Enemy has no weapon now
Fix code format
Refactor to hard-coded values to constants

Robot type and build cost are constants in robotFactory.js now
Moved robot cost and attribute into function
Remove unneed file

enemyTest.html and script/enemyFactory.js:
  removed due to game mode change.

eventTest.htm:
  removed due to event.js change (not in this commit).

robotGroupTest.html and script/robotGroup.js:
  removed due to migration to robot.js

combat.js:
  removed due to game mode change
event.js now manage explore
Migrate robotGroupFactory.js
Merge branch 'master' into Model-dev