Modified the .travis .yml file by adding the new download location for get-pip

.travis.yml

@@ -38,10 +38,10 @@ before_install:
   - sudo apt-get install -y python-coverage python-nose python-setuptools
   - sudo apt-get install -y python-mpi4py openmpi-bin openmpi-doc libopenmpi-dev
   # Install pip and cython
-  - wget https://raw.github.com/pypa/pip/master/contrib/get-pip.py
+  - wget https://bootstrap.pypa.io/get-pip.py
   - sudo python get-pip.py
-  - pip install --user cython==0.21.1
   - sudo pip install -U setuptools
+  - pip install --user cython==0.23.4
 
 install: 
   - cython --version