BLD: make LOCALE_OVERRIDE travis build use numpy 1.7 for some extra testing

Author: y-p

ci/install.sh

@@ -18,7 +18,7 @@ pip install $PIP_ARGS --use-mirrors cython nose python-dateutil pytz
 
 if [ ${TRAVIS_PYTHON_VERSION} == "3.2" ]; then
     sudo apt-get $APT_ARGS install python3-numpy;
-elif [ ${TRAVIS_PYTHON_VERSION} == "3.3" ]; then # should be >=3,3
+elif [ ${TRAVIS_PYTHON_VERSION} == "3.3" ] || [  x"$LOCALE_OVERRIDE" != x""  ]; then # should be >=3,3
     pip $PIP_ARGS install https://github.com/numpy/numpy/archive/v1.7.0.tar.gz;
 else
      pip install numpy==1.6.1