Travis-CI: Added '+slow' argument to test suite
Travis-CI: Added '+slow' argument to test suite

This runs two more tests (which don't actually seem to be slow...)

Igalia/snabbswitch,snabbco/snabb,SnabbCo/snabbswitch,eugeneia/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabb,alexandergall/snabbswitch,Igalia/snabbswitch,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,alexandergall/snabbswitch,snabbco/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabbswitch,Igalia/snabb,eugeneia/snabb,eugeneia/snabb,eugeneia/snabb,SnabbCo/snabbswitch,eugeneia/snabb,SnabbCo/snabbswitch,alexandergall/snabbswitch,alexandergall/snabbswitch,alexandergall/snabbswitch,Igalia/snabb,snabbco/snabb,alexandergall/snabbswitch,Igalia/snabbswitch,alexandergall/snabbswitch,alexandergall/snabbswitch,Igalia/snabbswitch,Igalia/snabb,snabbco/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabb