Merge pull request #199 from tbeckham/testing

JClouds test and supporting changes. Ivy dependency management
Remove Walrus tests from CI-run test list as they are unstable with latest version of AWS Java SDK.

Also, updated path to "3wolfmoon-download.jpg" asset in Basic Walrus test. Somehow it got pushed with absolute path on my dev machine. This change makes it relative to E4J dir. Other small formatting code style change to BasicWalrusTest