Adding an ant build.xml

#### Ant build.xml
Here is an ant script that I wrote for the original project. I ran this and it worked on our team source code. The build.xml compiles the source code, generates the javadocs, runs the unit tests and generates a unit test report.

#### How to run ant
1. install ant from here: http://ant.apache.org/bindownload.cgi
or if you have Homebrew installed, just type "brew install ant" from the command line

2. navigate to the 'Thing42orNull' directory (your local fork) in command line

3. type 'ant' into the command line, and it'll build

Please let me know what you think! @stevilstick @SterL @JamieWohletz @moquin101 @ericvangelder and Kim doesn't appear to be added to the repo yet, so I'll also email this PR link.