fetch and extract tasks part of issue 233

Here is a step forward for automation.

This commit, which is part of issue 233, EA-3 seed data prep, introduces two new gradle tasks. (They're in the readme.)

./gradlew dbload  still will do the same thing as before : functionally so all the same tests and procedures will work.

The new:
./gradlew seedDataFetch      goes and grabs data from a url.  It's set to the 1.3 seed data so no change in funcionality from now.  (except you can change cleanstart)
./gradlew seedDataExtract    extracts the contents of the tgz. 
./gradlew dbload    now loads the data that was fetched from those processes.

/database/seed-data is no longer used... these files are placed in the build directory.

I think this is ready to go.  Happy to talk over the changes