making travis-ci work again

.travis.yml

@@ -1,11 +1,12 @@
 language: python
 python:
   - "2.7"
+
+#Set virtual env with system-site-packages to true
+virtualenv:
+  system_site_packages: true
+
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
-install: 
-  - sudo apt-get install python-scipy
-  - pip install sphinx
-  - pip install . --use-mirrors
-# command to run tests, e.g. python setup.py test
-script: 
-  - nosetests --with-xcoverage --with-xunit --cover-package=GPy --cover-erase GPy/testing
+before_install: 
+  - sudo apt-get install -qq python-scipy python-pip
+  - sudo apt-get install -qq python-matplotlib