[tor-bugs] #6820 [TorBrowserButton]: Document all environment variables used by TorBrowserButton

[Tor Bug Tracker & Wiki]

#6820: Document all environment variables used by TorBrowserButton
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 Reporter:  rransom           |          Owner:  mikeperry
     Type:  task              |         Status:  new      
 Priority:  normal            |      Milestone:           
Component:  TorBrowserButton  |        Version:           
 Keywords:                    |         Parent:           
   Points:                    |   Actualpoints:           
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 Tor people need an easy-to-find complete list of the environment variables
 which TorBrowserButton reads.  A description of each environment variable
 would be nice to have, but not nearly as important once developer-y folks
 know what to grep for.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6820>
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