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adds md5sum link to quickstart

Fix for issue #172
Merge pull request #188 from spazm/gh-pages-adds-md5sum-link

adds md5sum link to quickstart
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Eric Lindvall worked on riemann-ruby-client.
Merge pull request #196 from mblair/thank-eric-for-something-else

Eric Lindvall worked on riemann-ruby-client.
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0.2.1
Add howto on percentage alerting