apache convention naming enforces to append bin or src to the tarball

rake test:versions
(in /Users/cyril/src/git/homebrew/Library/Homebrew/test)
Loaded suite /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake/rake_test_loader
Started
.................................................
Finished in 0.008669 seconds.

49 tests, 89 assertions, 0 failures, 0 errors