Merge branch 'hotfix/ee-duplicate-engine-option' into develop
Merge branch 'develop' of git://github.com/ctasca/magento-elasticsearch-module into develop
Merge branch 'master' into develop
Rename CHANGE_LOG to CHANGE_LOG.md
Modify CHANGE_LOG.md
Fix indexing on Magento EE

Fix indexing for EE with PHP versions either than 5.3.
Remove passing index array array by reference in iterator_apply
function.