fixed z-index issue with merge request versions widget
fixed z-index issue with merge request versions widget

iiet/iiet-git,jirutka/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,dreampet/gitlab,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,dreampet/gitlab