I modify the checkstyle config to have SAME_PACKAGE imports appear
before third-party imports. I think this better matches the intent of
the import ordering rules in the style guide.
https://google.github.io/styleguide/javaguide.html#s3.3.3-import-ordering-and-spacing
Expecially since it says the `com.google` imports only appear after
static imports if the source file is in the `com.google` package space.

…ls into lint

…ls into tswast-update-java-repo-tools

This script will allow us to run tests against a local server for
testing. Since the App Engine and Jetty server running and testing is so
similar, I combined the scripts rather than copying. The only
differences are which plugin to use and what string to wait for before
running curl.

Since the bookshelf sample also needs a `-Plocal` profile argument, I
extended the script to allow passing through arbitrary arguments to
Maven.

Run the local servers and verify they respond with code 200 to the "/"
path.

Note: bookshelf does not yet run in Travis, since we'll need to set up
client secrets credentials.

…ls into tswast-push-java-repo-tools

Also, update the README instructions for how to push changes upstream.