Add register_as() to simplify replacing formatter implementations (if necessary).
Add register_as() to simplify replacing formatter implementations (if necessary).

kymbert/behave,Abdoctor/behave,KevinOrtman/behave,charleswhchan/behave,jenisys/behave,metaperl/behave,mzcity123/behave,charleswhchan/behave,mzcity123/behave,kymbert/behave,vrutkovs/behave,vrutkovs/behave,jenisys/behave,KevinOrtman/behave,benthomasson/behave,spacediver/behave,Abdoctor/behave,spacediver/behave,Gimpneek/behave,joshal/behave,hugeinc/behave-parallel,Gimpneek/behave,metaperl/behave,Gimpneek/behave,benthomasson/behave,allanlewis/behave,connorsml/behave,allanlewis/behave,joshal/behave,connorsml/behave