Add a script to run all tests/checks

For now it's just the tests, but I will add more later.

Author: barisione

.travis.yml

@@ -21,4 +21,4 @@ before_install:
         python3.4
 
 script:
-  - ./tests/run.py
+  - ./run-checks

run-checks

@@ -0,0 +1,8 @@
+#! /bin/bash
+
+# Fail if any test fails.
+set -e
+
+echo "== RUNNING TESTS =="
+./tests/run.py
+echo