change lambda syntax to work with ruby 1.9
change lambda syntax to work with ruby 1.9

javierjulio/activeadmin,javierjulio/activeadmin,senid231/activeadmin,senid231/activeadmin,quikly/active_admin,varyonic/activeadmin,quikly/active_admin,siutin/activeadmin,cmunozgar/activeadmin,SoftSwiss/active_admin,cmunozgar/activeadmin,mrjman/activeadmin,varyonic/activeadmin,vytenis-s/activeadmin,maysam/activeadmin,deivid-rodriguez/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,mateusg/active_admin,mateusg/active_admin,quikly/active_admin,deivid-rodriguez/activeadmin,maysam/activeadmin,maysam/activeadmin,senid231/activeadmin,mateusg/active_admin,mauriciopasquier/active_admin,waymondo/active_admin,mrjman/activeadmin,gogovan/activeadmin,siutin/activeadmin,cmunozgar/activeadmin,mauriciopasquier/active_admin,deivid-rodriguez/activeadmin,wspurgin/activeadmin,whatcould/active_admin,SoftSwiss/active_admin,siutin/activeadmin,waymondo/active_admin,activeadmin/activeadmin,waymondo/active_admin,whatcould/active_admin,gogovan/activeadmin,varyonic/activeadmin,SoftSwiss/active_admin,vraravam/activeadmin,vytenis-s/activeadmin,mrjman/activeadmin,activeadmin/activeadmin,vytenis-s/activeadmin,wspurgin/activeadmin,wspurgin/activeadmin,mauriciopasquier/active_admin,whatcould/active_admin,gogovan/activeadmin,activeadmin/activeadmin,vraravam/activeadmin