Move source files into Gradle's expected structure.
Add initial build.gradle file.

Also moves library .jars, updates Eclipse files, and moves test
classes to the src/test/java directory.
Fix up the test classes.

Standardizes the test class names and converts JUnit 3-style classes
to JUnit 4-style.
Move some test classes to better packages.
Add the Gradle wrapper scripts

This will automatically install Gradle for anyone wanting to use
Gradle commands.
Add information on building the code to the README.
Fix an issue with absolute paths in the .classpath file.

Also, only run each test once in 'gradle test' and add comments to
the build.gradle file.
Merge pull request #61 from ggp-org/gradle

Gradle