Revert commit "Improve detect-duplicates.."

Review Request #411 — Created May 26, 2014 and submitted — Latest diff uploaded

ity
pants
pants-reviews
jsirois, patricklaw
This reverts commit 24cc65dbae0b29db4dc6c4f7ffb1b9cb8d41f87d. Caused a compilation failure only after clean.
Reverting this for now, to unblock folks.
$./build-support/bin/ci.sh
....

tests/python/pants_test/tasks/test_jar_publish_integration.py ..

========================================================================== 2 passed in 21.64 seconds ===========================================================================
tests.python.pants_test.tasks.jar_publish_integration                           .....   SUCCESS

[== CI SUCCESS ==]
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