Merge pull request #1 from AOEmedia/master

Fixed Aoe_Eav_Model_Config::getEntityAttributeCodes() method for case when entity type doesn't have attributes (some custom one) or there are no attributes in attribute set
Merge pull request #2 from AOEmedia/master

Added support for install/upgrade mode
Update README.md
Merge pull request #2 from Zyava/master

Update README.md