provide way to easily switch java versions

[travi]

Also, leave default state as sane config for day-to-day.

Consider:

• $PATH
• $JAVA_HOME

Paths to JDKs:

• Apple (Oracle) installs to: /System/Library/Frameworks/JavaVM.framework/Versions/
• Homebrew appears to install to: /Library/Java/JavaVirtualMachines/

Apple provides a tool to help ease setting $JAVA_HOME, but I assume it looks in the apple installations only: http://stackoverflow.com/questions/17885494/how-can-i-change-mac-oss-default-java-vm-returned-from-usr-libexec-java-home#answer-17886334

[travi]

http://richard.cyganiak.de/blog/2009/08/multiple-java-versions-on-os-x/