ENH: travis -- add a run which would execute with DUECREDIT_ENABLE

Author: yarikoptic

.travis.yml

@@ -8,6 +8,7 @@ python:
 env:
 - INSTALL_DEB_DEPENDECIES=true
 - INSTALL_DEB_DEPENDECIES=false
+- INSTALL_DEB_DEPENDECIES=true DUECREDIT_ENABLE=yes
 before_install:
 - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then wget http://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh
   -O miniconda.sh; else wget http://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
@@ -45,6 +46,7 @@ install:
 - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then conda install --yes vtk; fi
 - pip install python-coveralls
 - pip install nose-cov
+- if [ ! -z "$DUECREDIT_ENABLE"]; then pip install --user -v duecredit; fi
 # Add tvtk (PIL is required by blockcanvas)
 # Install mayavi (see https://github.com/enthought/mayavi/issues/271)
 - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then