Add check for gd extension
Add check for gd extension

kasunf/KanboardBOI,kasunf/KanboardBOI,djpadz/kanboard,BlueTeck/kanboard,stinnux/kanboard,lianguan/kanboard,vaikan/kanboard,marienfressinaud/kanboard,lianguan/kanboard,oliviermaridat/kanboard,patoi/kanboard,filhocf/kanboard,julesverhaeren/kanboard,mcorteel/kanboard,renothing/kanboard,jclafuente/kanboard,jtourt/kanboard,vaikan/kanboard,renothing/kanboard,jclafuente/kanboard,Nerdingher/kanboard,xavividal/kanboard,kanboard/kanboard,libin/kanboard,JeroenKnoops/kanboard,mcorteel/kanboard,mcorteel/kanboard,patoi/kanboard,BlueTeck/kanboard,thylo/kanboard,cdgeelen/kanboard,cdgeelen/kanboard,Busfreak/kanboard,oliviermaridat/kanboard,filhocf/kanboard,Nerdingher/kanboard,julesverhaeren/kanboard,dromek/kanboard,Busfreak/kanboard,kasunf/KanboardBOI,marienfressinaud/kanboard,djpadz/kanboard,jclafuente/kanboard,jtourt/kanboard,kanboard/kanboard,creador30/kanboard,Shaxine/kanboard,creador30/kanboard,Busfreak/kanboard,fguillot/kanboard,Shaxine/kanboard,cdgeelen/kanboard,vaikan/kanboard,thylo/kanboard,lianguan/kanboard,Nerdingher/kanboard,patoi/kanboard,jtourt/kanboard,JeroenKnoops/kanboard,xavividal/kanboard,BlueTeck/kanboard,julesverhaeren/kanboard,libin/kanboard,djpadz/kanboard,xavividal/kanboard,Shaxine/kanboard,kanboard/kanboard,filhocf/kanboard,dromek/kanboard,oliviermaridat/kanboard,fguillot/kanboard,thylo/kanboard,stinnux/kanboard,fguillot/kanboard,renothing/kanboard,stinnux/kanboard,dromek/kanboard