Fix #reload uses id instead of _id
Merge pull request #3792 from gauthier-delacroix/Fix-#reload-uses-id-instead-of-_id

Fix #reload uses id instead of _id
Added test for rails 4.2
use public_send instead of send
Run #bit tests on mongo 2.6+
Merge pull request #3796 from seuros/public_send

Test in rails 4.2 and use public_send instead of send
Preventing before_save allback from being called twice after a child create