Re #17 (and recent user input), reworked install docs.
Re #17 (and recent user input), reworked install docs.

jaraco/fabric,askulkarni2/fabric,tolbkni/fabric,getsentry/fabric,cgvarela/fabric,likesxuqiang/fabric,StackStorm/fabric,bitprophet/fabric,bspink/fabric,kxxoling/fabric,bitmonk/fabric,akaariai/fabric,qinrong/fabric,elijah513/fabric,MjAbuz/fabric,opavader/fabric,pgroudas/fabric,SamuelMarks/fabric,fernandezcuesta/fabric,ploxiln/fabric,rodrigc/fabric,itoed/fabric,hrubi/fabric,haridsv/fabric,xLegoz/fabric,TarasRudnyk/fabric,tekapo/fabric,cmattoon/fabric,rane-hs/fabric-py3,mathiasertl/fabric,pashinin/fabric,raimon49/fabric,sdelements/fabric,ericholscher/fabric,felix-d/fabric,simon-engledew/fabric,amaniak/fabric,kmonsoor/fabric,rbramwell/fabric