prefer TLS for SSL Tunnel connections #915
set correct peer name when connecting through a SSL tunnel proxy
use phpunit 4.3.5 until bug is fixed

See here for upstream report:
https://github.com/sebastianbergmann/phpunit/issues/1523
Merge branch 'phpunit-fix' into ssl-fixes

* phpunit-fix:
  use phpunit 4.3.5 until bug is fixed
travis config. 5.6 is released and test is fixed
seems we need to do SSL/TLS checks the other way round