Removed matplotlib dependency in travis

.travis.yml

@@ -19,7 +19,7 @@ before_install:
 - sudo apt-get install -qq --force-yes libboost-all-dev libblitz1-dev libmatio-dev libhdf5-serial-dev texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended
 - if [ -n "${NUMPYSPEC}" ]; then sudo apt-get install -qq libatlas-dev libatlas-base-dev liblapack-dev gfortran; fi
 - if [ -n "${NUMPYSPEC}" ]; then pip install --find-links http://wheels.astropy.org/ --find-links http://wheels2.astropy.org/ --use-wheel numpy$NUMPYSPEC; fi
-- pip install --find-links http://wheels.astropy.org/ --find-links http://wheels2.astropy.org/ --use-wheel sphinx matplotlib==1.3.0 nose==1.3.0 jinja2==2.6 cpp-coveralls pygments==1.6
+- pip install --find-links http://wheels.astropy.org/ --find-links http://wheels2.astropy.org/ --use-wheel sphinx nose==1.3.0 jinja2==2.6 cpp-coveralls pygments==1.6
 install:
 - python bootstrap-buildout.py
 - CFLAGS=-coverage ./bin/buildout