eternicode/bootstrap-datepicker — pull request #683 by fabdouglas (2013-11-04 13:53:22+00:00)
Title: Fix IE7 z-index issue with modal

When a datepicker in within a BS modal, the dropdown is not visible in IE7 since IE7 return '0' and not 'auto' value for undefined attribute.
Credits : http://stackoverflow.com/questions/13074624/how-do-i-get-twitter-bootstrap-datepicker-to-work-in-ie7