snow leopard 預設就安裝 maven 2.2.1 version
install in /usr/share/maven
how to upgrade.
1. 備份 old version maven
>cd /usr/shall
>sudo mv maven maven221
2. download maven (ex. 3.0.1)
3. >sudo cp -R /Users/xxxx/apache-maven-3.0.1 maven
4. check version
>mvn -version
