new barrier test
Merge branch 'master' of https://github.com/elms1990/mc715

Conflicts:
	projeto02/zookeeper-3.4.5/recipes/double-barrier/src/com/mc715/double-barrier/Barrier.java
	projeto02/zookeeper-3.4.5/recipes/double-barrier/src/com/mc715/double-barrier/Main.java
barreira simples funciona
Inclusa a documentação do projeto
Merge branch 'master' of https://github.com/elms1990/mc715

Conflicts:
	projeto02/zookeeper-3.4.5/recipes/barrier/src/com/mc715/barrier/Barrier.java