completed show building
Test robotGroup.js
Add test for enemy. Loot needs discussion.
add messageArea div CSS
includ engine.js
fix scrollbar of message area.
delete conflict file
solve merge problem.
add the structure of robot workers.

Good Luck, Carl.
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
add the stucture of Random event.

here we go.
event.js now manage explore
Migrate robotGroupFactory.js
Merge branch 'master' into Model-dev