Add new projects included in the June 15, 2013 update.

Author: xach

big-string/source.txt

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+mercurial https://bitbucket.org/tarballs_are_good/big-string

cl-indeterminism/source.txt

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+git git://github.com/mabragor/cl-indeterminism.git

cl-performance-tuning-helper/source.txt

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+git git://github.com/ichimal/cl-performance-tuning-helper.git

definer/source-disabled.txt

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+git git://common-lisp.net/projects/definer/definer.git

petit.package-utils/source.txt

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+git git://github.com/ichimal/petit.package-utils.git

utilities.print-items/source.txt

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+git git://github.com/scymtym/utilities.print-items.git

weblocks-tree-widget/source.txt

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+git git://github.com/html/weblocks-tree-widget.git