Add jdk8 and toggle between jdk7 and jdk8

jdk8-jdk7-toggle

## I'm running Mavericks.  No Java and no Maven anymore

## Download jdk8 --> https://jdk8.java.net/download.html
## then add the following to your ~/.profile and source

export JAVA_7_HOME=$(/usr/libexec/java_home -v1.7)
export JAVA_8_HOME=$(/usr/libexec/java_home -v1.8)
export JAVA_HOME=$JAVA_7_HOME
 
## Command line alias so we can switch to java6 or Java7
alias java7='export JAVA_HOME=$JAVA_7_HOME'
alias java8='export JAVA_HOME=$JAVA_8_HOME'


## If you haven't already, installed maven
## brew update
## brew install maven
## mvn -version