Merge pull request #65 from nlevitt/umbra

shut down the starter-restarter thread at crawl finish!!
oops, make "exit java process" button work again
Merge branch 'cosmetics' of github.com:nlevitt/heritrix3 into cosmetics
Merge remote-tracking branch 'origin/master' into cosmetics
Merge pull request #66 from nlevitt/cosmetics

oops, make "exit java process" button work again