Base production management 
fix #7
Merge branch 'master' of https://github.com/cchampet/Java_nanowars.git

Conflicts:
	src/engine/Base.java
	src/engine/Engine.java
Merge branch 'master' of https://github.com/cchampet/Java_nanowars.git
Merge branch 'master' of https://github.com/cchampet/Java_nanowars.git

Conflicts:
	src/engine/Engine.java