[libraries] added for plotting

.travis.yml

@@ -6,15 +6,15 @@ os:
 
 #language: python
 
-addons:
-  apt:
-    packages:
+#addons:
+#  apt:
+#    packages:
 #      - inkscape
 #      - libav-tools
 #      - gdb
 #      - mencoder
-      - dvipng
-      - libpng
+#      - dvipng
+#      - libpng
 #      - gfortran
 #      - libatlas-dev
 #      - libatlas-base-dev

travis_tests.py

@@ -33,6 +33,7 @@
 
 import matplotlib 
 matplotlib.use('pdf')
+matplotlib.rcParams['figure.size'] = (4,3)
 
 import nose 
 nose.main('GPy', defaultTest='GPy/testing/plotting_tests.py')