fixed auto documentation generation by reverting back to older markdown on Travis-CI

Author: jacobwilliams

.travis.yml

@@ -14,7 +14,8 @@ before_install:
   - sudo apt-get install graphviz
   - sudo ln -fs /usr/bin/gfortran-4.9 /usr/bin/gfortran && gfortran --version
   - sudo -H pip install FoBiS.py && FoBiS.py --version
-  - sudo -H pip install ford && ford --version
+  - sudo -H pip install ford==5.0.6 && ford --version
+  - sudo -H pip install --upgrade markdown==2.6.9
   - sudo -H pip install matplotlib
   - export PATH=".:$PATH"