Update environment settings for maven 3.3.1

For those who use 3.2.3 (as specified in Blackbird), here is the upgrade instruction.
cd ~/Downloads
wget https://www.apache.org/dist/maven/maven-3/3.3.1/binaries/apache-maven-3.3.1-bin.tar.gz
tar -zxvf apache-maven-3.3.1-bin.tar.gz -C ~/Applications/

Change-Id: I11d98faf1405e120fdff5748c5875c8842f4c58d
diff --git a/tools/dev/bash_profile b/tools/dev/bash_profile
index 4394a32..5acb19e 100644
--- a/tools/dev/bash_profile
+++ b/tools/dev/bash_profile
@@ -16,7 +16,7 @@
     fi
 fi
 
-export MAVEN=${MAVEN:-~/Applications/apache-maven-3.2.3}
+export MAVEN=${MAVEN:-~/Applications/apache-maven-3.3.1}
 
 export KARAF_VERSION=${KARAF_VERSION:-3.0.2}
 export KARAF_ROOT=${KARAF_ROOT:-~/Applications/apache-karaf-$KARAF_VERSION}