Adapt travis configuration in order to get Swig and mpi4py (both are …

…required for the Python wrapper test cases).

.travis.yml

@@ -21,16 +21,16 @@ env:
         BUILD_DIR=$TRAVIS_BUILD_DIR/SU2
     matrix:
         # Serial build and test
-        - CONFIGURE_COMMAND="./configure --prefix=$BUILD_DIR"
+        - CONFIGURE_COMMAND="./configure --prefix=$BUILD_DIR --enable-PY_WRAPPER"
           TEST_SCRIPT=serial_regression.py
         # Parallel build and test
-        - CONFIGURE_COMMAND="./configure --enable-mpi --with-cc=mpicc --with-cxx=mpicxx --prefix=$BUILD_DIR"
+        - CONFIGURE_COMMAND="./configure --enable-mpi --with-cc=mpicc --with-cxx=mpicxx --prefix=$BUILD_DIR --enable-PY_WRAPPER"
           TEST_SCRIPT=parallel_regression.py
 
 before_install:
     # install the necessary packages
     - sudo apt-get update -qq
-    - sudo apt-get install -qq python-numpy python-scipy mpich2
+    - sudo apt-get install -qq python-numpy python-scipy python-pip mpich2 swig
     # Move all of the test data for easier copying into the SU2 repo
     - mkdir TestData
     - shopt -s extglob
@@ -41,6 +41,7 @@ before_install:
     - git checkout develop
 
 install:
+    - sudo pip install mpi4py
     - echo $BUILD_DIR
     - echo $CONFIGURE_COMMAND
     - $CONFIGURE_COMMAND