hop: added {paranoid} arg to runHopCore (BREAKING-ish)

if true, paranoid will check to make sure hop is running in the right spot
It's breaking-ish because the API does not have a breaking change, but folks
might notice breaking behavior in if they have not followed the Hop convention
readme tweaks: convention is having github account be first link
hop: help is now a core concept in Hop and on by default (breaking-ish)

While API has not changed, the default behavior has changed to add a help task named 'help'.
This behavior can be customized with the `helpTaskName` arg to runHopCore.

When `null`, no help task is added
hop: changed default for color to be: ENV has CLICOLOR
hop: tweaks to help output