Merge pull request #1071 from rmcgibbo/travis

Use travis container infastructure

.travis.yml

 language: cpp
 compiler:
   - clang
+sudo: false
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - libpcre3
+      - libpcre3-dev
+      - gromacs
+      - swig
+      - doxygen
+      - clang-3.3
+      - llvm-3.3
+      - python-numpy
+      - python-scipy
+      - python-sphinx
+      - python-yaml
+      - python-pip
+      - python-virtualenv
 
 env:
   matrix:
@@ -12,18 +31,17 @@ env:
     - secure: "W2iPU6ooMujfzJNw9ElaEB8Go1rlNFJ5zEldr3FaH7SDRwqtqNOEp9CegCeG/hHtjg1j8TMyytQtvW+OaMKFIbq7Qqu7nIfwIFTV45vBHW6uwT/jAq/J3EgZ8K7JGyysVVHk86D8jT+xu90YVH5Tx/w97luxHOQGfSK8alhCszw="
 
 before_install:
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq libpcre3 libpcre3-dev gromacs
-  - sudo apt-get install -qq swig doxygen llvm-3.3
-  - sudo apt-get install -qq python-numpy python-scipy python-pip
-  - sudo pip install nose
+  - export CC=clang
+  - export CXX=clang++
   - export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer-3.3
 
 script:
+  - virtualenv --system-site-packages openmm_env
+  - source openmm_env/bin/activate
   - cmake -DCMAKE_INSTALL_PREFIX=$HOME/OpenMM -DOPENMM_BUILD_STATIC_LIB=$OPENMM_BUILD_STATIC_LIB .
   - make -j2
   - make -j2 install
-  - sudo make PythonInstall
+  - make PythonInstall
   - # Run the testInstallation script
   - python -m simtk.testInstallation
   - # run all of the tests, making sure failures at this stage don't cause travis failures
@@ -34,13 +52,14 @@ script:
   - if [ -s FailedTests.log ]; then ctest -V -I FailedTests.log; fi;
   - # run the python tests too
   - cd python/tests
+  - pip install nose
   - nosetests -vv --processes=-1 --process-timeout=200
+  - cd -
 
 after_success:
   # Get libraries necessary for building docs and pushing
   # them to S3
-  - sudo apt-get install python-sphinx python-yaml
-  - sudo pip install sphinxcontrib-bibtex boto
+  - pip install sphinxcontrib-bibtex boto
   - make DoxygenApiDocs
   - make sphinxhtml
   - python devtools/ci/push-docs-to-s3.py