Don't call concat

There, now there is slightly less code.
Implement search download progress reporting
Merge pull request #1465 from fredericksgary/cleanup

Don't call concat
Document reply's :skip-default-init option
Merge pull request #1468 from fredericksgary/skip-default-init

Document reply's :skip-default-init option
Subclass java.io.InputStream via gen-class.  Does not print progress yet, but does correctly download all search indices
Finishing touches
Yank gen-class definition from extstream.clj into search.clj; remove extstream.clj
Merge pull request #1466 from mpblair/search-progress

Implement search download progress reporting