Add __html__ method to StreamValues
Add __html__ method to StreamValues

This allows template authors to write `{{ page.stream_field }}` in
Jinja2 templates without having to jump through HTML escaping loops.

wagtail/wagtail,hanpama/wagtail,inonit/wagtail,wagtail/wagtail,davecranwell/wagtail,hanpama/wagtail,rsalmaso/wagtail,gasman/wagtail,FlipperPA/wagtail,thenewguy/wagtail,gogobook/wagtail,kaedroho/wagtail,iansprice/wagtail,mixxorz/wagtail,wagtail/wagtail,rsalmaso/wagtail,hamsterbacke23/wagtail,nutztherookie/wagtail,kurtw/wagtail,gasman/wagtail,nealtodd/wagtail,JoshBarr/wagtail,Tivix/wagtail,quru/wagtail,timorieber/wagtail,torchbox/wagtail,nilnvoid/wagtail,Tivix/wagtail,Toshakins/wagtail,quru/wagtail,nutztherookie/wagtail,nutztherookie/wagtail,nrsimha/wagtail,jnns/wagtail,nealtodd/wagtail,nealtodd/wagtail,wagtail/wagtail,kaedroho/wagtail,thenewguy/wagtail,nrsimha/wagtail,hamsterbacke23/wagtail,mikedingjan/wagtail,Toshakins/wagtail,iansprice/wagtail,serzans/wagtail,rsalmaso/wagtail,timorieber/wagtail,serzans/wagtail,nimasmi/wagtail,JoshBarr/wagtail,nilnvoid/wagtail,chrxr/wagtail,kurtw/wagtail,mixxorz/wagtail,jnns/wagtail,kurtrwall/wagtail,Toshakins/wagtail,thenewguy/wagtail,Tivix/wagtail,mixxorz/wagtail,mixxorz/wagtail,kurtw/wagtail,mayapurmedia/wagtail,iansprice/wagtail,nimasmi/wagtail,torchbox/wagtail,FlipperPA/wagtail,zerolab/wagtail,gasman/wagtail,mixxorz/wagtail,JoshBarr/wagtail,kaedroho/wagtail,hamsterbacke23/wagtail,chrxr/wagtail,nealtodd/wagtail,FlipperPA/wagtail,Toshakins/wagtail,kurtrwall/wagtail,jnns/wagtail,jnns/wagtail,takeflight/wagtail,zerolab/wagtail,thenewguy/wagtail,mikedingjan/wagtail,nutztherookie/wagtail,quru/wagtail,inonit/wagtail,zerolab/wagtail,mayapurmedia/wagtail,nilnvoid/wagtail,iansprice/wagtail,davecranwell/wagtail,rsalmaso/wagtail,kurtrwall/wagtail,nrsimha/wagtail,rsalmaso/wagtail,kurtrwall/wagtail,gasman/wagtail,hanpama/wagtail,kurtw/wagtail,gogobook/wagtail,nrsimha/wagtail,hamsterbacke23/wagtail,kaedroho/wagtail,FlipperPA/wagtail,nilnvoid/wagtail,serzans/wagtail,davecranwell/wagtail,JoshBarr/wagtail,serzans/wagtail,timorieber/wagtail,gogobook/wagtail,inonit/wagtail,mikedingjan/wagtail,gogobook/wagtail,zerolab/wagtail,mayapurmedia/wagtail,quru/wagtail,takeflight/wagtail,wagtail/wagtail,kaedroho/wagtail,nimasmi/wagtail,gasman/wagtail,zerolab/wagtail,inonit/wagtail,chrxr/wagtail,torchbox/wagtail,hanpama/wagtail,takeflight/wagtail,mikedingjan/wagtail,mayapurmedia/wagtail,Tivix/wagtail,chrxr/wagtail,nimasmi/wagtail,torchbox/wagtail,davecranwell/wagtail,takeflight/wagtail,thenewguy/wagtail,timorieber/wagtail