Upgraded to version 1.0-beta-6 of the the webstart-maven-plugin.  Had to adjust the configuration a little bit.  Verified that it works in Java 7 and Java 8.
Work around http://jira.codehaus.org/browse/MWEBSTART-269 until webstart-maven-plugin version 1.0-beta-7 is available.
Require the version of Java that is used for the class files.
Merge pull request #34 from DavidWhitlock/fetch-grader-gmail

Upgrade to the latest webstart-maven-plugin.