update travis file

Author: pancetta

.travis.yml

@@ -36,8 +36,8 @@ script:
   - mkdir data
   - which nosetests
   - nosetests tests --with-coverage --cover-inclusive --cover-package=pySDC,tutorial --cover-html --cover-html-dir=target/doc/build/test_coverage
-  - travis-sphinx build
+  - if [[ $TRAVIS_PYTHON_VERSION == 3.5 ]] travis-sphinx build
 
 after_success:
-    - travis-sphinx deploy
+  - if [[ $TRAVIS_PYTHON_VERSION == 3.5 ]] travis-sphinx deploy
 

docs/source/projects/doc_parallelSDC_nonlinear.rst

@@ -10,3 +10,12 @@ Results:
 
 .. image:: ../../../data/parallelSDC_fisher.png
    :scale: 50 %
+
+Full code: `projects/parallelSDC/newton_vs_sdc.py <https://github.com/Parallel-in-Time/pySDC/blob/master/projects/parallelSDC/newton_vs_sdc.py>`_
+
+.. literalinclude:: ../../../projects/parallelSDC/newton_vs_sdc.py
+
+Results:
+
+.. image:: ../../../data/parallelSDC_fisher_newton.png
+   :scale: 50 %

tests/test_projects/test_parallelSDC/test_fisher.py

@@ -1,3 +1,5 @@
+import sys
+
 from projects.parallelSDC.nonlinear_playground import main, plot_graphs
 from projects.parallelSDC.newton_vs_sdc import plot_graphs as plot_graphs_newton_vs_sdc
 
@@ -6,4 +8,5 @@ def test_main():
     plot_graphs()
 
 def test_plot_newton_vs_sdc():
-    plot_graphs_newton_vs_sdc(cwd='projects/parallelSDC/')
+    if sys.version_info >= (3, 0):
+        plot_graphs_newton_vs_sdc(cwd='projects/parallelSDC/')