Converting from Ant -> Maven.

Removing Ant build file and static libraries. Adding a basic pom file,
with the corresponding org.json dependency. Updated the location of the
source to be under src/main/java, to fit the requirements of Maven.
More Ant -> Maven work.

Removing Ant build file and static libraries. Adding a basic pom file,
with the corresponding org.json dependency. Updated the location of the
source to be under src/main/java, to fit the requirements of Maven.
Adding IntelliJ files to .gitignore
Adding target/ to .gitignore
Updating tests to use TestNG instead of JUnit.