run all tests, including plugins tests, on travis

.travis.yml

@@ -6,4 +6,4 @@ env:
 before_install:
   - script/bootstrap.sh
 
-script: fish ./spec/oh-my-fish.spec.fish
+script: script/run-tests.fish

script/run-tests.fish

@@ -0,0 +1,5 @@
+#!/usr/bin/env fish
+
+for test in (find * -type f -print | grep 'spec.fish')
+  fish $test
+end