added Magento CE install option

Added links to both installation as sample data for Magento 1.9.0.0
Magento CE 1.9 uses different sample data from the other versions in the preceding list
http://www.magentocommerce.com/knowledge-base/entry/installing-sample-data-archive-for-magento-ce
Merge pull request #328 from hans2103/patch-1

added Magento CE install option