Add bash + homebrew section and bash_profile mention
Add bash + homebrew section and bash_profile mention

Also removed instructions and references to set up git auto-completion.


boris-rea/hub,cpick/hub,rlugojr/hub,github/hub,dongjoon-hyun/hub,tomasv/hub,nlutsenko/hub,pcorpet/hub,cpick/hub,whilp/hub,tomasv/hub,whilp/hub,github/hub,rlugojr/hub,pcorpet/hub,rlugojr/hub,boris-rea/hub,tomasv/hub,whilp/hub,boris-rea/hub,dongjoon-hyun/hub,github/hub,pcorpet/hub,cpick/hub,nlutsenko/hub,dongjoon-hyun/hub,github/hub,nlutsenko/hub