Eclipse file generation script

Simple python script to generate the .project and .classpath files
for eclipse. The script bundles all jar dependencies into a single
jar file, collects all auto-generated java files into a single
source folder and adds them to the eclipse classpath.

java/com/google/domain/registry/tools/BUILD

@@ -11,6 +11,7 @@ package_group(
     packages = [
         "//java/com/google/domain/registry/testing",
         "//java/com/google/domain/registry/tools",
+        "//java/com/google/domain/registry/eclipse",
         "//javatests/com/google/domain/registry/tools",
     ],
 )