Add TestNG support

A lot of people JUnit for testing, but there are many who use TestNG (http://testng.org/doc/index.html) as well.
I just copied over the SnowTestSupport file to SnowTestSupportNG which uses TestNG specific annotations.

I am using this in one of my public projects, and for example you can have a look at it (http://www.imranzahid.org/imranzahid/events/blob/master/src/test/java/com/imranzahid/events/test/dao/UserDaoTestNG.java)