tests: upgrade quicktest.py + improve travis configuration

.travis.yml

@@ -1,19 +1,42 @@
 language: python
 
 python:
-  - "2.7"
+  - 2.6
+  - 2.7
+  - 3.2
+  - 3.3
+  - 3.4
 
 env:
-  - DJANGO_VERSION=1.4
-  - DJANGO_VERSION=1.5
+  - DJANGO_VERSION=1.4 MODULE=jsignature
+  - DJANGO_VERSION=1.5 MODULE=jsignature
+  - DJANGO_VERSION=1.6 MODULE=jsignature.tests
+  - DJANGO_VERSION=1.7 MODULE=jsignature.tests
 
 install:
   - pip install -r requirements.txt --use-mirrors
   - pip install -q Django==$DJANGO_VERSION --use-mirrors
   - pip install coverage
 
-script: coverage run quicktest.py jsignature
+script: coverage run quicktest.py $MODULE
 
 after_success:
  - pip install coveralls
  - coveralls
+
+# We need to exclude old versions of Django for tests with python 3.
+# We need to exclude old versions of Python for tests with Django >= 1.7.
+matrix:
+    exclude:
+        - python: 3.2
+          env: DJANGO_VERSION=1.4
+        - python: 3.3
+          env: DJANGO_VERSION=1.4
+        - python: 3.4
+          env: DJANGO_VERSION=1.4
+        - python: 3.4
+          env: DJANGO_VERSION=1.5
+        - python: 3.4
+          env: DJANGO_VERSION=1.6
+        - python: 2.6
+          env: DJANGO_VERSION=1.7