[tor-bugs] #22943 [Core Tor/Stem]: Add Travis CI configuration so that Github forks receive CI coverage

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#22943: Add Travis CI configuration so that Github forks receive CI coverage
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     Reporter:           |      Owner:  atagar
  patrickod              |
         Type:           |     Status:  new
  enhancement            |
     Priority:  Medium   |  Milestone:
    Component:  Core     |    Version:
  Tor/Stem               |   Keywords:  continuous-integration ci unit-
     Severity:  Normal   |  testing testing new-developers travis best-
                         |  practice
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
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 Similarly to #22636 we should add a Travis CI configuration with a
 comprehensive test matrix to the project root so that developers working
 on their own Github forks receive easy access to working CI setups.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22943>
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