Update list for Hello Engines!

Hello Engines! 8.0.0 changelog from September 21, 2012

Version 8.0.0 (Released September 21, 2012)

* New release

Complete "What's new": http://www.hello-engines.com/news/

Hello Engines! 7.2.4 changelog from March 17, 2012

Version 7.2.4 (Released February 21, 2012)

* Sorting by columns behavior was improved.
* Website analysis and rating functions were updated.

Complete "What's new": http://www.hello-engines.com/news/

Hello Engines! 7.2.2 changelog from December 23, 2011

Version 7.2.2 (Released November 4, 2011)

* Optimized analysis of large websites.
* The Google PageRank detection algorithm was updated.

Complete "What's new": http://www.hello-engines.com/news/

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