Changed build matrix for travis

.travis-devel-requirements.txt

@@ -0,0 +1,3 @@
+git+git://github.com/mitsuhiko/werkzeug.git#egg=Werkzeug
+git+git://github.com/mitsuhiko/jinja2.git#egg=Jinja2
+git+git://github.com/mitsuhiko/itsdangerous.git#egg=itsdangerous

.travis-lowest-requirements.txt

@@ -0,0 +1,3 @@
+Werkzeug==0.7
+Jinja2==2.4
+itsdangerous==0.21

.travis.yml

@@ -6,8 +6,18 @@ python:
   - pypy
   - 3.3
 
+env:
+  - REQUIREMENTS=lowest
+  - REQUIREMENTS=devel
+
+matrix:
+  exclude:
+    # Python 3 support currently does not work with lowest requirements
+    - python: "3.3"
+      env: REQUIREMENTS=lowest
+
 install:
-  - pip install git+git://github.com/mitsuhiko/werkzeug.git#egg=Werkzeug
+  - pip install -r .travis-$REQUIREMENTS-requirements.txt
   - pip install --editable .
 
 script: make test