Add docs and minor fixes (bind rv to underlying props in lm/adapter).
Add docs and minor fixes (bind rv to underlying props in lm/adapter).

tony/kivy,kivy/kivy,akshayaurora/kivy,jkankiewicz/kivy,matham/kivy,KeyWeeUsr/kivy,rafalo1333/kivy,el-ethan/kivy,aron-bordin/kivy,LogicalDash/kivy,bionoid/kivy,janssen/kivy,aron-bordin/kivy,Cheaterman/kivy,LogicalDash/kivy,KeyWeeUsr/kivy,bionoid/kivy,bionoid/kivy,manthansharma/kivy,LogicalDash/kivy,janssen/kivy,manthansharma/kivy,manthansharma/kivy,andnovar/kivy,matham/kivy,KeyWeeUsr/kivy,akshayaurora/kivy,darkopevec/kivy,autosportlabs/kivy,LogicalDash/kivy,aron-bordin/kivy,aron-bordin/kivy,jegger/kivy,inclement/kivy,el-ethan/kivy,kived/kivy,tony/kivy,rnixx/kivy,kived/kivy,akshayaurora/kivy,rnixx/kivy,jkankiewicz/kivy,andnovar/kivy,darkopevec/kivy,jegger/kivy,bionoid/kivy,matham/kivy,jkankiewicz/kivy,kivy/kivy,matham/kivy,darkopevec/kivy,KeyWeeUsr/kivy,autosportlabs/kivy,kived/kivy,rnixx/kivy,janssen/kivy,jegger/kivy,jkankiewicz/kivy,Cheaterman/kivy,inclement/kivy,el-ethan/kivy,Cheaterman/kivy,manthansharma/kivy,kivy/kivy,jegger/kivy,janssen/kivy,autosportlabs/kivy,rafalo1333/kivy,darkopevec/kivy,andnovar/kivy,rafalo1333/kivy,inclement/kivy,tony/kivy,Cheaterman/kivy