ADD: docstrings for hook class
ADD: docstrings for hook class

codevlabs/grab,liorvh/grab,shaunstanislaus/grab,maurobaraldi/grab,raybuhr/grab,codevlabs/grab,giserh/grab,kevinlondon/grab,huiyi1990/grab,DDShadoww/grab,alihalabyah/grab,istinspring/grab,shaunstanislaus/grab,pombredanne/grab-1,giserh/grab,DDShadoww/grab,istinspring/grab,lorien/grab,liorvh/grab,huiyi1990/grab,raybuhr/grab,pombredanne/grab-1,lorien/grab,alihalabyah/grab,SpaceAppsXploration/grab,SpaceAppsXploration/grab,maurobaraldi/grab,kevinlondon/grab