[tor-bugs] #3654 [Tor bundles/installation]: Write TBB version into prefs.js

[Tor Bug Tracker & Wiki]

#3654: Write TBB version into prefs.js
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 Reporter:  mikeperry                 |          Owner:  erinn                        
     Type:  defect                    |         Status:  new                          
 Priority:  normal                    |      Milestone:  TorBrowserBundle 2.2.x-stable
Component:  Tor bundles/installation  |        Version:                               
 Keywords:                            |         Parent:                               
   Points:                            |   Actualpoints:                               
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 In order for #3337 to work, we need to have a way for Torbutton to obtain
 the current TBB version somehow. Writing this value into prefs.js at build
 time seems like a fine plan to me.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3654>
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