networkx 1.10 dropped py26 support, changed travis testing dependency

.travis.yml

@@ -17,13 +17,13 @@ before_install:
     - bash .travis.fuseki_install_optional.sh
 
 install:
-    # iodate0.4.8 is problematic with Pypy, use fixed version
-    - if [[ $TRAVIS_PYTHON_VERSION == '2.5' ]]; then pip install --default-timeout 60 ordereddict; pip install --default-timeout 60 "simplejson"; pip install --default-timeout 60 "elementtree"; pip install --default-timeout 60 "html5lib==0.95"; fi
-    - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install --default-timeout 60 ordereddict; fi
     - if [[ ${TRAVIS_PYTHON_VERSION%%.*} == '2' ]]; then pip install --default-timeout 60 -r requirements.py2.txt;  pip install --default-timeout 60 "html5lib";fi
     - if [[ ${TRAVIS_PYTHON_VERSION%%.*} == '3' ]]; then pip install --default-timeout 60 -r requirements.py3.txt; fi
+    - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install --default-timeout 60 ordereddict 'networkx<1.10' ; fi
+    - if [[ $TRAVIS_PYTHON_VERSION != '2.6' ]]; then pip install --default-timeout 60 networkx ; fi
+    # isodate0.4.8 is problematic with Pypy, use fixed version
     - if [[ $TRAVIS_PYTHON_VERSION == 'pypy' ]]; then pip install --upgrade "https://bitbucket.org/gjhiggins/isodate/downloads/isodate-0.4.8.tar.gz"; pip install --default-timeout 60 "elementtree"; fi
-    - if [[ $TRAVIS_PYTHON_VERSION != '2.5' ]]; then pip install --default-timeout 60 coverage coveralls nose-timer networkx && export HAS_COVERALLS=1; fi
+    - pip install --default-timeout 60 coverage coveralls nose-timer && export HAS_COVERALLS=1
     - python setup.py install
 
 before_script: