ACCUMULO-1945 added help to bin/accumulo

Adding a check for the arg of help within the src/Main class should be sufficient for providing the help argument to bin/accumulo

Signed-off-by: Sean Busbey <busbey@cloudera.com>
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT

Conflicts:
	start/src/main/java/org/apache/accumulo/start/Main.java
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	start/src/main/java/org/apache/accumulo/start/Main.java
Merge branch '1.6.0-SNAPSHOT'