JDK 6 Support

(Imported from Google Code)
(Original author: ariel@arielvalentin.com)
<b>What steps will reproduce the problem?</b>

• The published jar is only compatible with JDK 7 support. At runtime we get the dreaded "Unsupported major.minor version 51.0 for runtime 50.0" exception
• Create a java project using JDK 6 and attempt to compile and execute the application.

<b>What is the expected output? What do you see instead?</b>

• We would like to use a classifier or version strategy to allow us to download a JDK 6 compatible version of DDMSence

<b>What version of the product are you using? On what operating system?</b>

• ddmsence 2.2.0 with JDK 6 on CentOS 6.4