Add docs for custom image models
Add docs for custom image models

hamsterbacke23/wagtail,hanpama/wagtail,gogobook/wagtail,marctc/wagtail,mjec/wagtail,darith27/wagtail,Toshakins/wagtail,rv816/wagtail,wagtail/wagtail,hanpama/wagtail,mayapurmedia/wagtail,inonit/wagtail,iansprice/wagtail,zerolab/wagtail,hamsterbacke23/wagtail,janusnic/wagtail,wagtail/wagtail,mephizzle/wagtail,kaedroho/wagtail,iho/wagtail,Toshakins/wagtail,stevenewey/wagtail,nutztherookie/wagtail,mephizzle/wagtail,gasman/wagtail,mayapurmedia/wagtail,rjsproxy/wagtail,m-sanders/wagtail,davecranwell/wagtail,serzans/wagtail,thenewguy/wagtail,thenewguy/wagtail,jnns/wagtail,rv816/wagtail,zerolab/wagtail,mjec/wagtail,kurtrwall/wagtail,WQuanfeng/wagtail,jnns/wagtail,gasman/wagtail,gasman/wagtail,rjsproxy/wagtail,mixxorz/wagtail,zerolab/wagtail,JoshBarr/wagtail,gasman/wagtail,FlipperPA/wagtail,hamsterbacke23/wagtail,rjsproxy/wagtail,takeshineshiro/wagtail,davecranwell/wagtail,nutztherookie/wagtail,nrsimha/wagtail,nimasmi/wagtail,mikedingjan/wagtail,nrsimha/wagtail,takeshineshiro/wagtail,takeflight/wagtail,rjsproxy/wagtail,takeflight/wagtail,quru/wagtail,chrxr/wagtail,jordij/wagtail,janusnic/wagtail,FlipperPA/wagtail,kaedroho/wagtail,serzans/wagtail,stevenewey/wagtail,kurtw/wagtail,wagtail/wagtail,nilnvoid/wagtail,jordij/wagtail,chrxr/wagtail,Pennebaker/wagtail,nimasmi/wagtail,inonit/wagtail,kurtrwall/wagtail,iansprice/wagtail,takeshineshiro/wagtail,mjec/wagtail,jnns/wagtail,timorieber/wagtail,KimGlazebrook/wagtail-experiment,kurtw/wagtail,iho/wagtail,nealtodd/wagtail,tangentlabs/wagtail,WQuanfeng/wagtail,nimasmi/wagtail,quru/wagtail,FlipperPA/wagtail,Tivix/wagtail,quru/wagtail,zerolab/wagtail,JoshBarr/wagtail,Pennebaker/wagtail,Toshakins/wagtail,mikedingjan/wagtail,kaedroho/wagtail,nealtodd/wagtail,Klaudit/wagtail,hamsterbacke23/wagtail,serzans/wagtail,thenewguy/wagtail,JoshBarr/wagtail,FlipperPA/wagtail,mayapurmedia/wagtail,Klaudit/wagtail,mayapurmedia/wagtail,kurtw/wagtail,rsalmaso/wagtail,mixxorz/wagtail,zerolab/wagtail,rsalmaso/wagtail,Klaudit/wagtail,tangentlabs/wagtail,kurtw/wagtail,mikedingjan/wagtail,stevenewey/wagtail,nrsimha/wagtail,jnns/wagtail,mephizzle/wagtail,jordij/wagtail,marctc/wagtail,WQuanfeng/wagtail,bjesus/wagtail,thenewguy/wagtail,darith27/wagtail,bjesus/wagtail,gogobook/wagtail,nilnvoid/wagtail,iansprice/wagtail,torchbox/wagtail,m-sanders/wagtail,janusnic/wagtail,KimGlazebrook/wagtail-experiment,JoshBarr/wagtail,tangentlabs/wagtail,quru/wagtail,tangentlabs/wagtail,mixxorz/wagtail,Pennebaker/wagtail,Tivix/wagtail,bjesus/wagtail,gogobook/wagtail,serzans/wagtail,Tivix/wagtail,takeshineshiro/wagtail,hanpama/wagtail,hanpama/wagtail,rsalmaso/wagtail,chrxr/wagtail,mixxorz/wagtail,torchbox/wagtail,davecranwell/wagtail,mixxorz/wagtail,janusnic/wagtail,nimasmi/wagtail,jordij/wagtail,wagtail/wagtail,KimGlazebrook/wagtail-experiment,nilnvoid/wagtail,kurtrwall/wagtail,Tivix/wagtail,torchbox/wagtail,rv816/wagtail,thenewguy/wagtail,stevenewey/wagtail,timorieber/wagtail,Pennebaker/wagtail,darith27/wagtail,gasman/wagtail,Toshakins/wagtail,iansprice/wagtail,mephizzle/wagtail,darith27/wagtail,bjesus/wagtail,rsalmaso/wagtail,rv816/wagtail,m-sanders/wagtail,takeflight/wagtail,gogobook/wagtail,rsalmaso/wagtail,timorieber/wagtail,m-sanders/wagtail,KimGlazebrook/wagtail-experiment,kaedroho/wagtail,nealtodd/wagtail,inonit/wagtail,kurtrwall/wagtail,nutztherookie/wagtail,nilnvoid/wagtail,Klaudit/wagtail,torchbox/wagtail,WQuanfeng/wagtail,kaedroho/wagtail,takeflight/wagtail,iho/wagtail,chrxr/wagtail,nealtodd/wagtail,timorieber/wagtail,mikedingjan/wagtail,marctc/wagtail,mjec/wagtail,inonit/wagtail,nrsimha/wagtail,iho/wagtail,marctc/wagtail,wagtail/wagtail,nutztherookie/wagtail,davecranwell/wagtail