CHOP-19. Removed comments about desired usage from NewsgroupWordCount.

Signed-off-by: Daisy Zhou <daisy@wibidata.com>
CHOP-3. Configure build to use checkstyle, findbugs, and scalastyle.

This commit modifies chopsticks to build with checks from checkstyle,
findbugs, and scalastyle. Changes are made to code so that checks pass.

Signed-off-by: Robert Chu <robert@wibidata.com>
CHOP-14. Verify that jars added to the DCache are jars.

Also cleaned up jar finding code.