test installing matplotlib with apt-get

.travis.yml

@@ -49,8 +49,8 @@ before_install:
   - sudo python get-pip.py
   - sudo pip install -U setuptools
   # test scipy from apt (much faster) and install matplotlib
-  - if [[ "$PYVERSION" == "2.7" ]]; then sudo apt-get install -y python-scipy && pip install --user cython==0.23.4; fi
-  - if [[ "$PYVERSION" == "3.x" ]]; then sudo apt-get install -y python3-scipy python3-pip python3-matplotlib cython3; else sudo pip install -U matplotlib && pip install --user cython==0.23.4; fi
+  - if [[ "$PYVERSION" == "2.7" ]]; then sudo apt-get install -y python-scipy python-matplotlib && pip install --user cython==0.23.4; fi
+  - if [[ "$PYVERSION" == "3.x" ]]; then sudo apt-get install -y python3-scipy python3-pip python3-matplotlib cython3; else pip install --user cython==0.23.4; fi
   # MPI
   - sudo apt-get install -y openmpi-bin libopenmpi-dev
   # install graph-tool and igraph

src/nngt/plot/__init__.py

@@ -30,8 +30,8 @@
 # module import
 
 from .custom_plt import palette
-#~ from .plt_properties import degree_distribution, betweenness_distribution
-#~ from .plt_activity import spike_raster
+from .plt_properties import degree_distribution, betweenness_distribution
+from .plt_activity import spike_raster
 
 __all__ = [ "degree_distribution", "betweenness_distribution", 'spike_raster' ]