How do I create terminal session independent env vars on OS 10.10?

I read Mortimer's answer here http://ift.tt/1wqHXV3 and added this file in /Users/MyName/Library/LaunchAgents called environment.plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"     
"http://ift.tt/vvUEPL">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>my.startup</string>
  <key>ProgramArguments</key>
  <array>
    <string>sh</string>
    <string>-c</string>
    <string>
    launchctl setenv GRADLE_HOME /Applications/gradle-2.0 
    launchctl setenv JAVA_HOME    
/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home
    </string>

  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>

Restarted my laptop, opened a terminal, and ran echo $GRADLE_HOME but it is still blank. How do I set an env var that is persistent throughout terminal sessions in Mac OS 10.10?