Squashed 'modules/base/eck_extras/' changes from 9b22291..6ef98c6

6ef98c6 === 7.x-2.5 === New: Add eck_extras_get_entity_bundles().

git-subtree-dir: modules/base/eck_extras
git-subtree-split: 6ef98c63f3e63b6a27601eef4c42af220042bd48
Merge commit '358e3bdd7f59bd16900244ccb918c130381f68c7' into 7.x-1.x