Add tests for Page.copy() process_child_object and exclude_fields
Add tests for Page.copy() process_child_object and exclude_fields

takeflight/wagtail,thenewguy/wagtail,FlipperPA/wagtail,zerolab/wagtail,takeflight/wagtail,nimasmi/wagtail,rsalmaso/wagtail,nimasmi/wagtail,mikedingjan/wagtail,wagtail/wagtail,mikedingjan/wagtail,wagtail/wagtail,gasman/wagtail,mixxorz/wagtail,thenewguy/wagtail,timorieber/wagtail,jnns/wagtail,gasman/wagtail,FlipperPA/wagtail,zerolab/wagtail,zerolab/wagtail,FlipperPA/wagtail,kaedroho/wagtail,kaedroho/wagtail,jnns/wagtail,torchbox/wagtail,zerolab/wagtail,nealtodd/wagtail,nealtodd/wagtail,timorieber/wagtail,mixxorz/wagtail,kaedroho/wagtail,torchbox/wagtail,wagtail/wagtail,thenewguy/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,mikedingjan/wagtail,mixxorz/wagtail,gasman/wagtail,wagtail/wagtail,mixxorz/wagtail,gasman/wagtail,nimasmi/wagtail,thenewguy/wagtail,torchbox/wagtail,timorieber/wagtail,takeflight/wagtail,wagtail/wagtail,mixxorz/wagtail,nimasmi/wagtail,torchbox/wagtail,FlipperPA/wagtail,nealtodd/wagtail,mikedingjan/wagtail,timorieber/wagtail,thenewguy/wagtail,rsalmaso/wagtail,takeflight/wagtail,jnns/wagtail,nealtodd/wagtail,jnns/wagtail,rsalmaso/wagtail,kaedroho/wagtail,kaedroho/wagtail,zerolab/wagtail,gasman/wagtail